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What does Catholic Christianity teach about war and peace?

The does not give Christians a clear answer about whether war is permitted or not, but it has a lot to say about , the , the importance of resolving conflict and working for peace.

Many Catholics believe that war should be avoided if possible, and should only be undertaken if all efforts to resolve an issue by peaceful means have failed. Many Christians see war as the result of a failure to live by God's standards.

There are many promises in the that war will come to an end in the perfect Kingdom of God.

In it states:

They shall beat their swords into ploughshares, and their spears into pruning hooks; nation shall not lift up sword against nation, neither shall they learn war any more.
— Isaiah 2:4

Catholics are told by in to support the state:

For the same reason you also pay taxes, for the authorities are ministers of God, attending to this very thing. Pay all of them their dues, taxes to whom taxes are due.
— Romans 13:6-7

Many Catholics think that fighting for your country is included among these 'dues'.

However, some Catholics are and believe that war is never justified.

What do Catholics say about justice?

Catholics believe that justice comes from God and they should work for justice in whatever situation they find themselves. They will often use 82 from the Old Testament to justify this position:

Defend the rights of the poor and orphans; be fair to the needy and helpless. Rescue them from the power of evil men.
— Psalm 82

How is the sanctity of life relevant to war?

The Catholic Church teaches that God gave them life and that each human is made 'in the image of God'. Therefore the belief is that life is and should be protected. The forbid murder and in , Jesus tells his followers to:

Love your enemies and pray for those who persecute you.
— Matthew 5:44

Some Catholics believe that there are times when the only way to defeat injustice or defend the idea of the sanctity of life is to declare war. Other Catholics think that they should only use peaceful and non-violent methods. Jesus told his disciples:

If anyone strikes you on the right cheek, turn to him the other also.
— Matthew 5:39

Jesus' peers would have understood a slap on the right cheek as a very serious insult. Jesus is telling his followers not to respond in the same way.

Just before his arrest, in the Gospel of , Jesus told his followers:

And let him who has no sword sell his mantle and buy one.
— Luke 22:36

This suggests that Jesus accepted the right to be able to defend yourself.