Know this, that he that is a friend to himself, is a friend to all men.
Seneca
A friend is he who sets his heart upon us, is happy with us, and delights in us; does for us what we want, is willing and fully engaged to do all he can for us, on whom we can rely in all cases.
William Ellery Channing
To act the part of a true friend requires more conscientious feeling than to fill with credit and complacency any other station or capacity in social life.
Mrs Ellis
There are no rules for friendship. It must be left to itself; we cannot force it any more than love.
Hazlitt