
Catholics have a variety of responses to war, which are informed by the Church's teachings and the Bible. The Catechism of the Catholic Church outlines that the fifth commandment forbids the intentional destruction of human life, and that war is accompanied by evils and injustices. The Church encourages prayer and action to prevent war, promoting peace as the ideal state. The Just War Theory, which is a part of Catholic social doctrine, acknowledges that war may be justly waged under specific conditions, such as legitimate defence and rigorous moral legitimacy. However, some Catholics oppose all forms of war, citing Jesus' message of non-violence. The Church has also spoken against the arms race and the production and sale of arms, emphasizing their negative impact on the common good. Ultimately, Catholics are guided by their conscience and the Church's teachings when facing the complexities of war and striving for peace.
| Characteristics | Values |
|---|---|
| Catholic Church's view on war | The Catechism of the Catholic Church speaks of the possibility of legitimate defence by means of military force, which involves demonstrating that certain "rigorous conditions of moral legitimacy" have been met. |
| Just War Theory | The Church's "Just War Theory" or "Just War Doctrine" weakens the Christian moral imperative to develop methods for nonviolent conflict because it always leaves recourse to violence. |
| Catholic response to war | Catholics are bound to inform themselves about social developments and consider them in light of the Church's social doctrine. |
| Catholic conscience | Catholics must follow their conscience, but they are also obliged to form their consciences properly and in accord with the truth. |
| Catholic objection to war | If a Catholic believes a war to be unjust and his role constitutes direct participation, he has the right and obligation to object and even refuse to participate, regardless of the consequences. |
| Catholic leaders' response to war | Catholic leaders have spoken against wars, such as the War on Iraq, but they have stopped short of insisting upon a course of action for Catholics in the military. |
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What You'll Learn

The Catholic Church's Just War Doctrine
The Catholic Church's "Just War Doctrine" is a set of principles that guide the Church's response to war and conflict. The doctrine is rooted in the Catechism of the Catholic Church, which provides a framework for evaluating the morality and ethics of war.
The Catechism states that "all citizens and governments are obliged to work for the avoidance of war" (2308), recognising the “evils and injustices that accompany all war” (2307). It emphasises the importance of prayer and action to free humanity from the "ancient bondage of war". The Church's teaching on war is not a mere theoretical exercise but a practical guide for Catholics facing the complexities of politics and war.
The Just War Doctrine sets out strict conditions for legitimate defence by military force, recognising that war may be justly waged under certain circumstances. Firstly, the damage inflicted by the aggressor must be lasting, grave, and certain, and all other means of resolution must have been proven impractical or ineffective. Secondly, the use of arms must not produce evils greater than the evil being eliminated, a consideration that weighs heavily in the modern era of destructive weapons.
The Doctrine also makes a distinction between soldiers and civilians, emphasising that the killing of unarmed civilians or subdued prisoners cannot be justified. It further highlights the responsibility of nations to prevent unjust aggression, especially against the helpless, and the obligation to defend their people from attack.
While the Just War Doctrine acknowledges the complexity of war and the potential need for military force, it is challenged by those who argue that it weakens the Christian moral imperative to pursue nonviolent conflict resolution. They emphasise that non-violence is central to Jesus' message and that the Just War Doctrine can always leave open the possibility of violence.
In conclusion, the Catholic Church's Just War Doctrine provides a nuanced framework for evaluating war, balancing the recognition of evil and injustice with the imperative to strive for peace and avoid violence whenever possible. It guides Catholics facing complex political and military situations, urging them to work for peace and only consider war as a last resort under strict moral conditions.
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The fifth commandment
The Catholic Church's position on war is informed by the fifth commandment, which forbids the intentional destruction of human life. This commandment, also known as "You shall not kill" in Exodus 20:13, is understood to prohibit the taking of innocent human life.
The Catechism of the Catholic Church, in its section on war, acknowledges the evils and injustices that accompany all wars. It urges everyone to pray and take action so that divine goodness may free humanity from the ancient bondage of war. The Church, therefore, insists that all citizens and governments work towards avoiding war.
The Church's interpretation of the fifth commandment allows for legitimate defence, including the use of military force, under specific conditions. This concept is known as the Just War Theory, attributed to St. Augustine and later refined by St. Thomas Aquinas. A just war is defensive, undertaken only to repel an aggressor, and only when all other peaceful means have failed. It must also have a reasonable chance of success without causing greater evils than those being addressed.
Despite this theoretical allowance, the Church emphasizes that the arms race does not ensure peace. Jesus, as noted in Scripture, sought peace through self-sacrifice rather than violent means. Furthermore, the Church condemns the extermination of people, nations, or ethnic minorities as a mortal sin, and individuals are morally bound to resist orders commanding genocide or the killing of unarmed civilians.
In conclusion, while the fifth commandment does not absolutely prohibit killing, the Catholic Church interprets it as a strong deterrent to war. The Church promotes peace and urges its followers to exhaust all peaceful options before considering the use of force, ensuring that the protection of innocent human life remains a central concern.
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Conscientious objection
The Catholic Church's Catechism teaches that the fifth commandment forbids the intentional destruction of human life. The Catechism also teaches that the killing of unarmed civilians or prisoners who have already been subdued cannot be justified and must be resisted as an example of "conscientious objection".
The Church has a duty to speak out against an unjust war and, if necessary, to oblige Catholics to object and refuse to participate. Catholics who are convinced that a war is unjust and that their role constitutes direct participation have the right and obligation to object and refuse to take part, regardless of the consequences.
The Second Vatican Council endorsed laws that would provide for the care of those who refuse to bear arms for reasons of conscience, provided that they accept some other form of service to the community. The Magisterium (teaching authority) of the Church has the right and duty to speak out if a nation acts unjustly against human life.
The Catechism of the Catholic Church speaks of the possibility of legitimate defence by military force, but this requires that "rigorous conditions of moral legitimacy" have been met. The Church rejects the idea that the arms race ensures peace, and states that the production and sale of arms affect the common good of nations and the international community.
The concept of conscientious objection has a long history, with examples such as the Medieval Orkneyinga Saga mentioning Magnus Erlendsson, Earl of Orkney, who refused to fight in a Viking raid due to his religious convictions. In more recent times, Ben Salmon was a Catholic conscientious objector during World War I, and Franz Jägerstätter was executed in 1943 for refusing to serve in the Nazi Wehrmacht.
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The arms race
The Catholic Church has expressed concern about the arms race and its impact on global peace and stability. Catholic observers have noted that the development of new weapons, such as hypersonic weapons and ballistic missile submarines, has led to an accelerating arms race among nations. This race for more advanced and destructive weapons diverts resources away from efforts for disarmament and global peacemaking, which is a key teaching of the Catholic Church.
The Church's position on the arms race is informed by its commitment to non-violence and the pursuit of peace. The Catechism of the Catholic Church, as referenced in paragraphs 2307-2317, emphasizes that the intentional destruction of human life is forbidden. The Church urges prayer and action to free humanity from the scourge of war and its accompanying evils and injustices.
Archbishop Gabriele Caccia, the Vatican's representative to the UN, has called for nuclear stockpiles to be capped, citing Pope Francis' encyclical "Fratelli Tutti, on Fraternity and Social Friendship." Pope Francis has consistently emphasized the need for global peacemaking and multilateralism, highlighting the negative impact of the arms race on international relations and human suffering.
Catholic peace activists and policy experts share these concerns, warning that the arms race weakens global stability and threatens human life. They critique the notion that the arms race ensures peace, arguing that it instead promotes violence and conflict among nations. The Church's position on the arms race aligns with its broader teachings on war and peace, emphasizing the importance of just and peaceful solutions over recourse to violence.
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The role of the United Nations
The Catholic Church's position on war is informed by the Just War Theory, which holds that war can be justly waged under certain conditions. These conditions are outlined in the Catechism of the Catholic Church, which emphasises the importance of respecting human life and minimising the evils and injustices that accompany warfare. While the Church recognises the right of nations to defend themselves, it also urges Catholics to work for peace and resolve disputes through non-violent means whenever possible.
In this context, the United Nations plays a crucial role in upholding international peace and security. The United Nations Charter, which all member states are obliged to respect, provides a framework for preventing and resolving conflicts between nations. The Charter's principles, such as refraining from the threat or use of force against other states, are consistent with the Catholic Church's emphasis on peaceful resolution and respect for human life.
The United Nations Security Council, in particular, is tasked with addressing acts of aggression, threats to international peace, and violations of the Charter's principles. While the Security Council has faced criticism for its inability to respond effectively to certain crises, it remains the primary mechanism for maintaining international peace and security. The Catholic Church, through the Holy See, has consistently stressed the importance of respecting and upholding the United Nations Charter, especially in times of conflict.
In situations where the United Nations is unable to prevent or resolve conflicts, the question arises as to whether unilateral or multilateral ad hoc measures can be justified. From a Catholic perspective, the Just War Theory provides a framework for evaluating the moral legitimacy of such actions. However, the Church also recognises the right of individuals to conscientiously object to participation in any war, especially those that are deemed unjust or contrary to Catholic social doctrine.
Overall, the United Nations plays a vital role in upholding the principles of peace, justice, and respect for human life, which are central to the Catholic Church's teachings on war and conflict. While the United Nations is not perfect in its ability to prevent or resolve all conflicts, it provides an essential framework for international cooperation and the peaceful resolution of disputes between nations.
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Frequently asked questions
The Catechism of the Catholic Church teaches that the fifth commandment forbids the intentional destruction of human life. The Catechism also states that the Church urges everyone to prayer and action so that "the divine Goodness may free us from the ancient bondage of war". The Catechism further emphasizes the importance of safeguarding peace and working to avoid war, while recognizing the obligation of states to defend their people from attack.
The Catholic Church recognizes the concept of just war theory, which holds that under certain rigorous conditions, war may be justly waged as a form of legitimate defence. These conditions include the gravity of the threat, the exhaustion of all other options, and the principle of proportionality, ensuring that the use of force does not cause greater evils than the evil being eliminated. However, some Catholics argue that just war theory weakens the commitment to nonviolent conflict resolution, which they see as central to Jesus' message.
Catholics in the military who believe a particular war is unjust have the right and obligation to object and even refuse to participate based on their conscience. However, they are urged to seek counsel from a Catholic chaplain before taking such a drastic step. The Church's teaching authority (Magisterium) has the duty to speak out against unjust wars and guide Catholics in conscience.










































