It is far better to be silent than merely to increase the quantity of bad books.

Descartes constructed as noble a road of science, from the point at which he found geometry to that to which he carried it, as Newton himself did after him. ... He carried this spirit of geometry and invention into optics, which under him became a completely new art.

Alas...I too have known love, that ruler of hearts, that soul of our soul: it's never brought me anything except one kiss and twenty kicks in the rump. How could such a beautiful cause produce such an abominable effect on you?

Philosopher: A lover of wisdom, which is to say, Truth.

I would rather obey a fine lion, much stronger than myself, than two hundred rats of my own species.

If there are atheists, who is to be blamed if not the mercenary tyrants of souls who, in revolting us against their swindles, compel some feeble spirits to deny the God whom these monsters dishonour?

Let us meet four times a year in a grand temple with music, and thank God for all his gifts. There is one sun. There is one God. Let us have one religion. Then all mankind will be brethren.