Philosophy is written in that great book which ever lies before our eyes ... We cannot understand it if we do not first learn the language and grasp the symbols in which it is written. The book is written in the mathematical language ... without whos

If I were again beginning my studies, I would follow the advice of Plato and start with mathematics

Spots are on the surface of the solar body where they are produced and also dissolved, some in shorter and others in longer periods. They are carried around the Sun; an important occurrence in itself

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual

By denying scientific principles, one may maintain any paradox

You cannot teach a man anything; you can only help him discover it in himself

I have never met a man so ignorant that I couldn't learn something from him

And who can doubt that it will lead to the worst disorders when minds created free by God are compelled to submit slavishly to an outside will? When we are told to deny our senses and subject them to the whim of others? When people devoid of whatsoever competence are made judgesover experts and are granted authority to treat them as they please?These are the novelties which are apt to bring about the ruin ofcommonwealths and the subversion of the state

Doubt is the father of invention

Facts which at first seem improbable will even on scant explanation drop the cloak which has hidden them and stand forth in naked and simple beauty