The person who doesn't know something can't be done will often find a way to go ahead and do it.

It is man's destiny to ponder on the riddle of existence and, as a byproduct of his wonderment, to create a new life on this earth.

Every father should remember one day his son will follow his example, not his advice.

I often say that research is a way of finding out what you are going to do when you can't keep on doing what you are doing now.

If a fellow wants to be nobody in the business world, let him neglect sending the mailman to somebody on his behalf.

In America we can say what we think, and even if we can't think, we can say it anyhow.

The world hates change, yet it is the only thing that has brought progress.