Magnanimity

Magnanimity is a great treasure; harmonious affinity with others is wonderful, Detachment from name and gain averts trouble; happiness makes older people feel young.

...and thirdly, I have I behaved exceedingly ill to you, and, consequently, feel it quite magnanimous not to hate you, which is the established rule on such occasions." "Pray, continue your magnanimity."

The duke had not taken advantage of this, but Bonaparte had later rewarded his magnanimity by having him put to death.