Work while others are wishing.

IF PARENTS PASS ENTHUSIASM ALONG TO THEIR CHILDREN, THEY WILL LEAVE THEM AN ESTATE OF INCALCULABLE VALUE

What a man's mind can create, man's character can control.

To get a great idea, come up with lots of them.

I have always consistently opposed high-tension and alternating systems of electric lighting...not only on account of danger, but because of their general unreliability and unsuitability for any general system of distribution.

I cannot believe in the immortality of the soul. No, all this talk of an existence for us, as individuals, beyond the grave is wrong. It is born of our tenacity of life - our desire to go on living - our dread of coming to an end.

Our greatest weakness lies in giving up.