John McLean, Allen v. Hammond — Opinion of the Court
“ The equity of the complainant is so obvious, that it is difficult to make it more clear by illustration. No case, perhaps, that it is difficult to make supposed, where the principle on which courts of equity give relief, is more strongly presented than in this case. The contract was entered into through the mistake of both parties; it imposes great hardship and injustice on the appellee, and it is without consideration. These grounds, either of which, in ordinary cases, is held sufficient for relief in equity, unite in favor of the appellee. ”
