Where a man has no sense of value in himself, we are not likely to have any higher esteem of him.
 David Hume, An Enquiry Concerning the Principles of Morals (1751). copy citation

Context

“as in the instance of ingratitude, as well as meanness. Where we expect a beauty, the disappointment gives an uneasy sensation, and produces a real deformity. An abjectness of character, likewise, is disgustful and contemptible in another view. Where a man has no sense of value in himself, we are not likely to have any higher esteem of him. And if the same person, who crouches to his superiors, is insolent to his inferiors (as often happens) , this contrariety of behaviour, instead of correcting the former vice, aggravates it extremely by the addition of a vice still more odious.” source