The expression being once brought in as subservient to the will, soon becomes the principal part of the promise; nor will a man be less bound by his word, though he secretly give a different direction to his intention, and withhold the assent of his mind.

But though the expression makes, on most occasions, the whole of the promise, yet it does not always so; and one who should make use of any expression, of which he knows not the meaning, and which he uses without any sense of the consequences, would not certainly be bound by it.

Nay, though he know its meaning, yet if he use it in jest only, and with such signs as evidently show, that he has no serious intention of binding himself, he would not lie under any obligation of performance; but it is necessary, that the words be a perfect expression of the will, without any contrary signs.

Nay, even this we must not carry so far as to imagine, that one, whom, by our quickness of understanding, we conjecture, from certain signs, to have an intention of deceiving us, is not bound by his expression or verbal promise, if we accept of it; but must limit this conclusion to those cases where the signs are of a different nature from those of deceit.

All these contradictions are easily accounted for, if justice arise entirely from its usefulness to society; but will never be explained on any other hypothesis.
It is remarkable that the moral decisions of the JESUITS and other relaxed casuists, were commonly formed in prosecution of some such subtilties of reasoning as are here pointed out, and proceed as much from the habit of scholastic refinement as from any corruption of the heart, if we may follow the authority of Mons.Bayle.See his Dictionary, article Loyola.