If your brother sins, rebuke him, and if he repents, forgive him; and if he sins against you seven times in the day, and turns to you seven times and says, “I repent,” you must forgive him.

Jesus
Luke 17:3-4

God forgives, but (not without) repentance.

Muhammed
The Sayings of Muhammed, 209

The unwillingness to admit that we have been hurt is one of the major impediments to forgiving.

Robert D. Enright, PhD
Forgiveness is a Choice, 2001

If you forgive men their trespasses, your heavenly Father also will forgive you; but if you do not forgive men their trespasses, neither will your heavenly Father forgive you your trespasses.

Jesus
Matthew 6:14-15

People will sometimes forgive you the good you have done them, but seldom the harm they have done you.

W. Somerset Maugham
A Writer’s Notebook, 1949

You saw his weakness, that he’l ne’er forgive.

Friedrich von Schiller
William Tell, 3.1, 1804

Ministers ask: Is it possible for God to forgive Man? And when I think of what has been suffered- of the centuries of agony and tears, I ask: Is it possible for man to forgive God?

Robert Ingersoll
The Foundations of Faith

Of God we ask one favor,
That we may be forgiven-
For what, he is presumed to know-
The Crime, from us, is hidden.

Emily Dickinson

The folly which we might have ourselves committed is the one which we are least ready to pardon in another.

Joseph Roux
Meditations of a Parish Priest, 4.84, 1886

Who pardons easily invites offense.

Pierre Corneille
Cinna, 4.1, 1639