Luke 17:3-4

3 Take heed to yourselves: If thy brother trespass against thee, rebuke him; and if he repent, forgive him.
4 And if he trespass against thee seven times in a day, and seven times in a day turn again to thee saying, I repent; thou shalt forgive him.

I'll admit I really struggle with this. If someone 'trespasses against me' and then apologizes soon after, it's sometimes really hard for me to forgive them. If they continually get do it, and apologize every time it's even harder to forgive them, because I'm always thinking that the apology won't last very long. But I have to forgive them. The Lord wants me to forgive everyone, and I want to be on the Lord's side. This is something I've got to work on.
Hope it gave you something to think about as well.