The Lord sometimes allows people who are devoted to Him to fall into such dreadful vices; and this is in order to prevent them from falling into a still greater sin-pride. Your temptation will pass and you will spend the remaining days of your life in humility. Only do not forget your sin. Seraphim of Sarov
The stupid neither forgive nor forget; the naïve forgive and forget; the wise forgive but do not forget. Thomas Szasz
Let us remember the poor, and not forget kindness to strangers; above all, let us love God with all our soul, and might, and strength, and our neighbour as ourselves. Athanasius of Alexandria
A fowl does not forget where it lays it eggs. Nigerian Proverb
Work is good provided you do not forget to live. Bantu Proverb
What youth learns, age does not forget. Danish Proverb