If he can, then all free and voluntary contracts cease, and are void in the world; there needs nothing to dissolve them at any time but power enough: and all the grants and promises of men in power are but mockery and collusion: for can there be anything more ridiculous than to say, I give you and yours this forever, and that in the surest and most solemn way of conveyance can be devised; and yet it is to be understood, that I have a right, if I please, to take it away from you again tomorrow?