Reply Obj. 3: Adam would have advanced in natural knowledge, not in the number of things known, but in the manner of knowing; because what he knew speculatively he would subsequently have known by experience. But as regards supernatural knowledge, he would also have advanced as regards the number of things known, by further revelation; as the angels advance by further enlightenment. Moreover there is no comparison between advance in knowledge and advance in merit; since one man cannot be a principle of merit to another, although he can be to another a principle of knowledge. _______________________
FOURTH ARTICLE [I, Q. 94, Art. 4]
Whether Man in His First State Could Be Deceived?
Objection 1: It would seem that man in his primitive state could have been deceived. For the Apostle says (1 Tim. 2:14) that "the woman being seduced was in the transgression."
Obj. 2: Further, the Master says (Sent. ii, D, xxi) that, "the woman was not frightened at the serpent speaking, because she thought that he had received the faculty of speech from God." But this was untrue. Therefore before sin the woman was deceived.
Obj. 3: Further, it is natural that the farther off anything is from us, the smaller it seems to be. Now, the nature of the eyes is not changed by sin. Therefore this would have been the case in the state of innocence. Wherefore man would have been deceived in the size of what he saw, just as he is deceived now.
Obj. 4: Further, Augustine says (Gen. ad lit. xii, 2) that, in sleep the soul adheres to the images of things as if they were the things themselves. But in the state of innocence man would have eaten and consequently have slept and dreamed. Therefore he would have been deceived, adhering to images as to realities.
Obj. 5: Further, the first man would have been ignorant of other men's thoughts, and of future contingent events, as stated above (A. 3). So if anyone had told him what was false about these things, he would have been deceived.
On the contrary, Augustine says (De Lib. Arb. iii, 18): "To regard what is true as false, is not natural to man as created; but is a punishment of man condemned."
I answer that, in the opinion of some, deception may mean two things; namely, any slight surmise, in which one adheres to what is false, as though it were true, but without the assent of belief—or it may mean a firm belief. Thus before sin Adam could not be deceived in either of these ways as regards those things to which his knowledge extended; but as regards things to which his knowledge did not extend, he might have been deceived, if we take deception in the wide sense of the term for any surmise without assent of belief. This opinion was held with the idea that it is not derogatory to man to entertain a false opinion in such matters, and that provided he does not assent rashly, he is not to be blamed.