The Philosophy of Law: Private Right, § 37: The Contract of Donation
The Contract of Donation signifies the gratuitous alienation (gratis) of a Tiling or Right that is Mine. It involves a relation between me as the Donor (donans), and another Person as the Donatory (donatarius), in accordance with the Principle of Private Right, by which what is mine is transferred to the latter, on his accept ance of it, as a Gift (donum). However, it is not to be presumed that I have voluntarily bound myself thereby so as to be compelled to keep my Promise, and that I have thus given away my Freedom gratuitously, and, as it were, to that extent thrown myself away. Nemo mum jactare prxsumitur. But this is what would happen, under such circumstances, according to the principle of Right in the Civil state; for in this sphere the Donatory can compel me, under certain conditions, to perform my Promise. If, then, the case comes before a Court, according to the conditions of Public Right, it must either be presumed that the Donor has consented to such Compulsion, or the Court would give no regard, in the Sentence, to the consideration as to whether he intended to reserve the Right to resile from his Promise or not; but would only refer to what is certain, namely, the condition of the Promise and the Acceptance of the Donatory. Although the Promisor, therefore, thought—as may easily be supposed—that he could not be bound by his Promise in any case, if he ‘rued’ it before it was actually carried out, yet the Court assumes that he ought expressly to have reserved this condition if such was his mind; and if he did not make such an express reservation, it will be held that he can be compelled to implement his Promise. And this Principle is assumed by the Court, because the administration of Justice would otherwise be endlessly impeded, or even made entirely impossible.