It's not that I'm so smart, it's just that I stay with problems longer
Eighty percent of success is showing up
I respect faith, but doubt is what gets you an education
The greatest obstacle to discovery is not ignorance, it is the illusion of knowledge
The pessimist complains about the wind, the optimist expects it to change, the realist adjusts the sails
If you don't make mistakes, you're not working on hard enough problems. And that's a big mistake
You can never get enough of what you don't really need
Insanity doing the same thing over and over again and expecting different results
Do not confuse motion and progress. A rocking horse keeps moving but does not make any progress
I don't know the key to success, but the key to failure is trying to please everybody

Tom is used to these kinds of situations.
Tom is very good at changing the subject.
Tom is very good at imitating the way Mary talks.
Tom is waiting for you to say something.
Tom is wise enough not to do such a thing.
Tom recently dyed his hair red.
Tom denied the allegations.
Tom fell off his motorcycle.
Tom whistled through his teeth.

One's best successes come after his greatest disappointments.
To live is the rarest thing in the world. Most people exist. That is all I was really optimistic. I thought in two or three years