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

My definition of an educated man is the fellow who knows the right thing to do at the time it has to be done. You can be sincere and still be stupid.

Every honest researcher I know admits he's just a professional amateur. He's doing whatever he's doing for the first time. That makes him an amateur. He has sense enough to know that he's going to have a lot of trouble, so that makes him a professional.

No one would have crossed the ocean if he could have gotten off the ship in the storm.

here is a great difference between knowing a thing and understanding it. You can know a lot and not really understand anything.

Industry prospers when it offers people articles which they want more than they want anything they now have. The fact is that people never buy what they need. They buy what they want.

People think of the inventor as a screwball, but no one ever asks the inventor what he thinks of other people.