Why is it certain that each human being must be his or her own self-owner?
No other possibility makes sense
If anyone else were to be my owner, how did he acquire me?
If we were each owned by the company or the state, we'd have no motive to work hard
Because if I were to deny I own myself, I'd be expressing an opinion as if it were mine, yet which says it is not mine. This is a contradiction and so must be false
Because if I did not have the power to make my own decisions, I'd be incapable of making any contract - including one to marry, or to pay for goods or services upon which life depends.