Friendship is a strong and ...

Friendship is a strong and habitual inclination in two persons to promote the good and happiness of one another.
 Eustace Budgell

Quotes from the same author

When you have gained a victory, do not push it too far; 'tis sufficient to let the company and your adversary see 'tis in your power but that you are too generous to make use of it.
 Eustace Budgell