I think, therefore matter is capable of thinking.

There is no such thing as perpetual tranquility of mind while we live here.

For after the subject is removed or the eye shut, we still retain an image of the things seen, though more obscure than when we see it...Imagination, therefore, is nothing more than decaying sense.

Man is distinguished not only by his reason, but also by this singular passion, from all other animals.

As, in Sense, that which is really within us, is (as I have said before) only Motion, caused by the action of external objects, but in appearance; to the Sight, Light and Color; to the Ear, Sound; to the Nostril, Odor, &c.

Reason is the Soul of the Law.

Whatsoever accidents or qualities our senses make us think there be in the world, they are not there, but are seemings and apparitions only. The things that really are in the world without us, are those motions by which these seemings are caused. And this is the great deception of sense, which also is by sense to be corrected. For as sense telleth me, when I see directly, that the colour seemeth to be in the object; so also sense telleth me, when I see by reflection, that colour is not in the object.