Should Christians curse?

I don't believe we should. In Matthew 26:74, it says that Peter began to curse. This may seem small, but when you look into the reason Peter started cursing, it was to prove he didn't have anything to do with Christ, he was trying to prove that he was a heathen, so when we look at that, we realize that we shouldn't curse if we claim to be Christians.

Whether Christians should curse or not should be taken into account from the word of Christ when he said judge righteously. It's a judgment call, and we should decide whether or not Christians should curse taking the word of God into account. Not just the letter, but the Spirit of the letter.