The book which most deserved to be banned would be a catalog of banned books.

The construction of the universe is certainly very much easier to explain than is that of the plant.

The greatest events occur without intention playing any part in them; chance makes good mistakes and undoes the most carefully planned undertaking. The world's greatest events are not produced, they happen.

Man is a masterpiece of creation if for no other reason than that, all the weight of evidence for determinism notwithstanding, he believes he has free will.

Man loves company - even if it is only that of a small burning candle.

I ceased in the year 1764 to believe that one can convince one’s opponents with arguments printed in books. It is not to do that, therefore, that I have taken up my pen, but merely so as to annoy them, and to bestow strength and courage on those on our own side, and to make it known to the others that they have not convinced us.

To write brashly about some things, it is almost necessary not to know much about them.