…It seems to me that if forgiveness should always be unconditional, then Jesus would have prayed, “Father, forgive them, even if they know what they are doing!” So isn’t the condition for which they were forgiven that they did “not know what they are doing”? Isn’t ignorance of one’s sin a condition one might meet in order for me to forgive her?
Well, let’s take a look at Matthew chapter 18.
Matthew 18:7 "Woe to the world because of things that cause sin! Such things must come, but woe to the one through whom they come!"
The “woe to the one through whom they come” seems to me to be an unrepentant sinner.
Matthew 18:12 "If a man has a hundred sheep and one of them goes astray, will he not leave the ninety-nine in the hills and go in search of the stray?"
One who needs to be searched for because they have gone astray seems to me to be an unrepentant sinner.
Matthew 18:16-17 "If your brother sins (against you), go and tell him his fault between you and him alone. If he listens to you, you have won over your brother. If he does not listen, take one or two others along with you, so that ‘every fact may be established on the testimony of two or three witnesses.’ If he refuses to listen to them, tell the church. If he refuses to listen even to the church, then treat him as you would a Gentile or a tax collector."
One in need of correction is an unrepentant sinner. The theme I see here is the constant seeking out and attempting to bring into the fold an unrepentant sinner. There does seem to come a point that we are to treat the person as a “Gentile or tax collector” (whatever that means

). However, then this episode comes up…
**Matthew 18:21-23 Then Peter approaching asked him, “Lord, if my brother sins against me, how often must I forgive him? As many as seven times?” Jesus answered, "I say to you, not seven times but seventy-seven times. That is why the kingdom of heaven may be likened to a king who decided to settle accounts with his servants. **
Having just read the other accounts above and Jesus saying that at a certain point we can treat the person just like a “Gentile or tax collector”, I can understand from Peter’s standpoint that perhaps the limit of offering forgiveness is seven times. However, the parable reads as follows:
**Matthew 18:24-35 “When he began the accounting, a debtor was brought before him who owed him a huge amount. Since he had no way of paying it back, his master ordered him to be sold, along with his wife, his children, and all his property, in payment of the debt. At that, the servant fell down, did him homage, and said, ‘Be patient with me, and I will pay you back in full.’ Moved with compassion the master of that servant let him go and forgave him the loan. When that servant had left, he found one of his fellow servants who owed him a much smaller amount. He seized him and started to choke him, demanding, ‘Pay back what you owe.’ Falling to his knees, his fellow servant begged him, ‘Be patient with me, and I will pay you back.’ But he refused. Instead, he had him put in prison until he paid back the debt. Now when his fellow servants saw what had happened, they were deeply disturbed, and went to their master and reported the whole affair. His master summoned him and said to him, ‘You wicked servant! I forgave you your entire debt because you begged me to. Should you not have had pity on your fellow servant, as I had pity on you?’ Then in anger his master handed him over to the torturers until he should pay back the whole debt. So will my heavenly Father do to you, unless each of you forgives his brother from his heart.” **
Imagine the utter confusion by some of those listening to these words of Jesus. I’m not sure if the parable of the prodigal son was already taught by Jesus. In that parable, the son who wasted his inheritance came to a point that he would repent of his actions. The father did not seek out his son in that scenario, the son concluded he needed to repent so he could hopefully be fed. Here Jesus talks about seeking out unrepentant sinners without them turning towards him at all! Then Jesus gives a parable of someone who
did repent of their actions and he ends up being tortured for a debt he can not repay.
Does that make Jesus’s forgiveness unconditional? It appears that forgiveness that is given can be withdrawn! Hmmm, I suppose you could argue that the
condition put on the wicked servant was that he needed to treat those who owed him a debt in the same manner as Jesus treats us when he looks at our sins. But what of the seemingly endless cycle of the wicked servant who now has sinned again (owes another debt) by not forgiving the debt of his fellow servant? Doesn’t that potentially put us back at square one time and time again? He sins, he repents, he sins again. I think that’s where the unforgivable sin of sin against the Holy Spirit comes in. Hmmm, unforgivable sin? Well, perhaps that’s the realm of the third person of the Holy Trinity. Maybe Jesus forgives unconditionally, but the Holy Spirit does not? Nothing like opening up another can of worms.
Going back to your question: Do you need to forgive her? Well, Jesus forgave you - you should do the same. If you don’t, aren’t you acting in the same manner as the wicked servant in the parable? In the Lord’s Prayer, we even ask God to forgive us as we forgive others.
Oh, let me just throw this out there while we’re at it. Isn’t it ironic that this information comes from Matthew’s Gospel, a former tax collector?
