 The view that there can be thought without a body is also Descartes’s view. Indeed, Hobbes may be thinking of Descartes’s argument for that view in the Sixth Meditation. A key claim in Descartes’s argument is that “the fact that I can clearly and distinctly understand one thing apart from another is enough to make me certain that the two things are distinct” (Descartes 1641a, 2.54). Descartes argues, via that claim, from his ability to clearly and distinctly conceive of mind apart from body and vice versa, to the conclusion that mind and body are really distinct (i.e., are two substances, not one). Abstracting away from the details, we have an argument from the conceivability of mind without body to the conclusion that the mind is not physical. And such an argument is one of Hobbes’s targets in the “gross errors” passage.