Understanding a question is half an answer.

Better to do a little well, then a great deal badly.

A multitude of books distracts the mind.

I always found that, if I began to worry, the best thing I could do was focus upon doing something useful and then work very hard at it. Soon, I would forget what was troubling me.

Let's go invent tomorrow instead of worrying about what happened yesterday.

The first requisite of success is the ability to apply your physical and mental energies to one problem without growing weary.