True, there are always exceptions to this rule.
With their hands on each other's shoulders, at arm's length they stood, a likely pair to look at, smiling frankly and joyfully into each other's eyes.

When it is without self-interest, friendship between man and man is a fine and noble thing.

It is known best in the stress of storms, in the hour of sorrow and adversity.

Friendship, to be perfect, must be without any sense of obligation; for obligation implies that one or the other is in debt, and the debtor is always wondering when he will have to pay.

Between these two men only the slightest favors had been exchanged.