Believe and act as if it were impossible to fail.

Don't be afraid to stumble. Any inventor will tell you that you don't follow a plan far before you strike a snag. If, out of 100 ideas you get one that works, it's enough.

We have reason not to be afraid of the machine, for there is always constructive change, the enemy of machines, making them change to fit new conditions.

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

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

Nothing ever built arose to touch the skies unless some man dreamed that it should, some man believed that it could, and some man willed that it must.

Don't bring anything to me but trouble.