Discusses these words of the Our Father:
Dimitte nobis debita nostra.
He now tells the Father to forgive us our debts since we ourselves forgive. Thus, He says, going on with the prayer He teaches us, “And forgive us, Lord, our debts as we forgive our debtors.”
How the Lord must esteem this love we have for one another! Indeed, Jesus could have put other virtues first and said: forgive us, Lord, because we do a great deal of penance or because we pray much and fast or because we have left all for You and love You very much. He didn’t say forgive us because we would give up our lives for You, or, as I say, because of other possible things. But He said only, “forgive us because we forgive.”
Saint Teresa of Avila
The Way of Perfection, 36.1,7
Carmelite Quotes 
I’ve never read that before. It’s wonderful!!!
Chapter 36 is a real gem