The present is saturated with the past and pregnant with the future.

Philosophy consists mostly of kicking up a lot of dust and then complaining that you can't see anything.

I have said more than once, that I hold space to be something purely relative, as time; an order of coexistences, as time is an order of successions.

Virtue is the habit of acting according to wisdom.

...a distinction must be made between true and false ideas, and that too much rein must not be given to a man's imagination under pretext of its being a clear and distinct intellection.

The knowledge which we have acquired ought not to resemble a great shop without order, and without an inventory; we ought to know what we possess, and be able to make it serve us in need.

The art of discovering the causes of phenomena, or true hypotheses, is like the art of deciphering, in which an ingenious conjecture often greatly shortens the road.