Falstaff: 'The better part of valour is discretion; in the which better part I have saved my life.'
Shakespeare, in Henry IV, Part One.
Proverbs 16:32
He that is slow to anger is better than the mighty; and he that ruleth his spirit than he that taketh a city.
Proverbs 19:11
The discretion of a man deferreth his anger; and it is his glory to pass over a transgression.