“We read that we ought to forgive our enemies; but we do not read that we ought to forgive our friends.”

Nana (1880).

As quoted in Diogenes Laërtius, Lives and Opinions of Eminent Philosophers, "Pythagoras", Sect. 23, as translated in Dictionary of Quotations http://archive.org/details/dictionaryquota02harbgoog (1906) by Thomas Benfield Harbottle, p. 320

1950s, Loving Your Enemies (Christmas 1957)
Context: Forgiveness does not mean ignoring what has been done or putting a false label on an evil act. It means, rather, that the evil act no longer remains as a barrier to the relationship. Forgiveness is a catalyst creating the atmosphere necessary for a fresh start and a new beginning. It is the lifting of a burden or the canceling of a debt. The words "I will forgive you, but never forget what you have done" never explain the real nature of forgiveness. Certainly one can never forget, if that means erasing totally for his mind. But when we forgive, we forget in the sense that the evil deed is no longer a mental block impeding a new relationship. Likewise, we can never say, "I will forgive you, but I won't have anything further to do with you." Forgiveness means reconciliation, a coming together again. Without this, no man can ever love his enemies. The degree to which we are able to forgive determines the degree to which we are able to love our enemies.

Chap. 1: "To Whom Much is Forgiven..."
The New Being (1955)

Wir sollen immer verzeihen, dem Reuigen um seinetwillen, dem Reuelosen um unseretwillen.
Source: Aphorisms (1880/1893), p. 25.

Aristotle, 9.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 5: The Peripatetics

Source: My Double Life (1907), Ch. 33 <!-- p. 369 -->
Context: Life is short, even for those who live a long time, and we must live for the few who know and appreciate us, who judge and absolve us, and for whom we have the same affection and indulgence. The rest I look upon as a mere crowd, lively or sad, loyal or corrupt, from whom there is nothing to be expected but fleeting emotions, either pleasant or unpleasant, which leave no trace behind them. We ought to hate very rarely, as it is too fatiguing; remain indifferent to a great deal, forgive often and never forget.

Source: Living Wicca: A Further Guide for the Solitary Practitioner

A Narrative of Some of the Lord's Dealings with George Müller Written by Himself, First Part.
First Part of Narrative