I find it incredibly hard to love my neighbour who beats his wife, steals from me, throws his rubbish in my garden, and is a general nuisance, but I can do, as Paul advises and he suffered terribly.
Do not pay anyone back evil for evil, but focus your thoughts on what is right in the sight of all people. If possible, so far as it depends on you, live in peace with all people. Do not take revenge, dear friends, but leave room for God's wrath. For it is written, "Vengeance belongs to me. I will pay them back, declares the Lord." But "if your enemy is hungry, feed him. For if he is thirsty, give him a drink. If you do this, you will pile burning coals on his head." Do not be conquered by evil, but conquer evil with good.
(Rom 12:17-21 ISV)