if [consciousness] could not be trusted you could not make a rational choice. You might think you were Mary one day and Martha the next. There would be no sense of identity or continuity.
To use consciousness, reason, and voluntary choice as an argument for contrary choice actually runs counter to your argument.
Suppose we narrated the fall of Adam to someone who’d never heard it. We’d mention that Adam possessed only good inclinations but that he ended up acting against those inclinations in a terribly self-destructive way.
The first thing our listener would do is ask if Adam had lost his power of reason. We’d tell him that Adam’s reason was working perfectly and that, in your words, he knew “exactly what he was doing.” To the extent that he was deceived, he allowed himself to be deceived.
Our listener would then ask if Adam had lost the ability to act on his desires – if he’d become a kind of robot, or a man in a sleepwalking state. We’d tell him not only that Adam didn’t act against his desires, but that his actions perfectly reflected those desires, that those desires were authentically his.
Our listener, thinking hard at this point to explain something that was becoming increasingly difficult to make sense of, might ask if Adam’s consciousness were defective, if perhaps he’d lost his ability to distinguish between himself and the serpent and that he simply acted in place of the serpent without being aware that he was a separate and independent person. We’d tell him that Adam’s consciousness - his self-awareness - was functioning without the slightest flaw and that he had no problem at all distinguishing himself from anybody else.
Our listener, now exasperated and confused, would ask how it was possible for such a creature to act in the manner he did. Here you’d respond by calling his attention to Adam’s consciousness, reason, and voluntary choice –
the very things that could serve as a plausible explanation for Adam’s behavior only if they weren’t working properly.
If a ship flounders in the middle of the ocean, and we hear about it in the news, we don’t expect the ship’s plight to be explained to us by an assurance that everything was in nautical trim. If we pressed the Coast Guard for an explanation, and we were told that the engine was working the way it was designed to work, the rudder was fine, the hull was watertight, the navigation instruments were perfectly calibrated, the weather was idyllic, and the captain and crew had total control over the ship and possessed no inclination to let their ship flounder, we’d wonder when the Coast Guard official would come around to offering us an actual explanation. We wouldn’t say, well, the ship and crew were models of maritime perfection, and so then there’s obviously no mystery. In fact that’s the last thing we’d say.
And yet that’s exactly what you’re asking us to believe.