His voluntary choice is evidence that what he so chooses is desirable, or at the least
endurable, to him, and his good is on the whole best provided for by allowing him to
take his own means of pursuing it. But by selling himself for a slave, he abdicates his
liberty; he forgoes any future use of it beyond that single act. He therefore defeats, in
his own case, the very purpose which is the justification of allowing him to dispose of
himself. (133)