The reality or illusoriness of the objects on which passions are employed is irrelevant to the certainty of the passions themselves.

For let us carry Scepticism ever so far, let us doubt, if we can, of every thing about us; we cannot doubt of what passes within our-selves. Our Passions and Affections are known to us. They are certain, whatever the Objects may be, on which they are employ’d. Nor is it of any concern to our Argument, how these exterior Objects stand; whether they are Realitys, or mere Illusions; whether we wake or dream. For ill Dreams will be equally disturbing. And a good Dream, if Life be nothing else, will