There is a little gland in the brain in which the soul exercises its functions in a more particular way than in the other parts.

Some years ago I was struck by the large number of falsehoods that I had accepted as true in my childhood, and by the highly doubtful nature of the whole edifice that I had subsequently based on them. I realized that it was necessary, once in the course of my life, to demolish everything completely and start again right from the foundations if I wanted to establish anything at all in the sciences that was stable and likely to last.

The principal effect of the passions is that they incite and persuade the mind to will the events for which they prepared the body.

Good sense is, of all things among men, the most equally distributed; for every one thinks himself so abundantly provided with it, that those even who are the most difficult to satisfy in everything else, do not usually desire a larger measure of this quality than they already possess.

But in my opinion, all things in nature occur mathematically.

And thereby make ourselves, as it were, the lords and masters of nature.

There is a great difference between mind and body insomuch as body is by nature always divisible, and the mind is entirely indivisible.