One has to do something new in order to see something new.

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

Love is blind, but marriage restores its sight.

The course of the seasons is a piece of clockwork, with a cuckoo to call when it is spring.

Do not say hypothesis, and even less theory: say way of thinking.

What a blessing it would be if we could open and shut our ears...as easily as we open and shut our eyes.

If all else fails, the character of a man can be recognized by nothing so surely as by a jest which he takes badly.