1Thes5:15- See that no one pays back evil for evil, but always try to do good to each other and to all people.
E.R.T. means evil repayment transaction; there are several transactions allowed in God's central bank, for example, your are permitted to pay good for evil done to you countless times but God is not in support of paying evil for evil.
I know there are things that hurt so deep into the marrow, God's word doesn't change for our feelings, no matter how bad we've been hurt, we are to do good to everyone including the bad people. God is merciful and we ought to be also.
If he can make his sun to shine on the good and wicked, his rain to grow the crops of the wicked, then we should emulate our father. Leave vengeance unto God, doing good to evil people is a warfare strategy that will heap coals of fire on your enemies while you live in victory.
- Make up your mind to be good to everyone, esp those that have hurt you, as you do that, you'll sense peace&joy from within.