I have always felt it is my destiny to build a machine that would allow man to fly.

When you are alone you are all your own.

A wave is never found alone, but is mingled with as many other waves as there are uneven places in the object where the said wave is produced.

If you call painting dumb poetry, the painter may call poetry blind painting.

When Fortune comes, seize her in front with a sure hand, because behind she is bald.

Here is a thing which the more it is needed the more it is rejected: and this is advice, which is unwillingly heeded by those who most need it, that is to say, by the ignorant.

The noblest pleasure is the joy of understanding.