“The stupid neither forgive nor forget; the naïve forgive and forget; the wise forgive but do not forget.”
"Personal Conduct" http://books.google.com/books?id=IYOcAQAAQBAJ&q=%22The+stupid+neither+forgive+nor+forget+the+na%C3%AFve+forgive+and+forget+the+wise+forgive+but+do+not+forget%22&pg=PA177#v=onepage, p. 51. http://openlibrary.org/works/OL15151528W/The_Second_Sin
The Second Sin (1973)
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Thomas Szasz 70
Hungarian psychiatrist 1920–2012Related quotes

“Man forgets. God forgives. Man forgets God's Truth. God forgives man's ignorance.”
Songs of the Soul (1971)
“Do not feel ashamed to forgive and forget.”
Nahj al-Balagha, Letter 53: An order to Malik Al-Ashtar
Variant: The best deed of a great man is to forgive and forget.

“Surely it is much more generous to forgive and remember, than to forgive and forget.”
"An Essay on the Noble Science of Self-Justification"; Tales and Novels, vol. 1, p. 213.

“Forgiveness is too easy. I can forget by indifference, but not forgive. I prefer revenge.”