The man who is wantonly profuse of his promises ought to sink his credit as much as a tradesman would by uttering a great number of promissory notes payable at a distant day. The truest conclusion in both cases is, that neither intend or will be able to pay. And as the latter most probably intends to cheat you of your money, so the former at least designs to cheat you of your thanks.

Miscellanies: Essays, poems and dialogues (ed. 1743)