Make me the the master of education, and I will undertake to change the world.

Nothing is necessitated whose opposite is possible.

...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.

God makes nothing without order, and everything that forms itself develops imperceptibly out of small parts.

I am convinced that the unwritten knowledge scattered among men of different callings surpasses in quantity and in importance anything we find in books, and that the greater part of our wealth has yet to be recorded.

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.

I hold that it is only when we can prove everything we assert that we understand perfectly the thing under consideration.