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.

The opportunities of man are limited only by his imagination. But so few have imagination that there are ten thousand fiddlers to one composer.

The price of progress is trouble.

The future can be anything we want it to be, providing we have the faith and that we realize that peace, no less than war, required blood and sweat and tears.

It is not a disgrace to fail. Failing is one of the greatest arts in the world.

If I have had any success, it's due to luck, but I notice the harder I work, the luckier I get.

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