 If Huet’s phrase “the human mind can attend to only one thing at a time” means that a we can think of only one thing at a time, then the Cartesians will reject this premise. Indeed, Descartes explicitly does so (see CSM III 335 / AT V 149). But Régis responds by rejecting the premise that the eye sees only one thing at a time, reinforcing the analogy between the mind and the eye. He argues that if thought is to the mind as light is to the eye, then when we see something, there are three distinct aspects of the event: “the eye that sees, the action by which it sees, and the object seen” (Réponse 35). Suppose now that we say, “I see the light.” Must we suppose that there must be a second light illuminating first? No; we see the light by itself. Similarly for thought—if Huet grants the analogy, he “must conclude that [a thought] is known through itself” (Réponse 36).