Intelligence is the ability to adapt to change.

A life not lived for others is not a life.

The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.

A man is but the product of his thoughts. What he thinks he becomes.

There are two things a person should never be angry at, what they can help, and what they cannot.

My goal is simple. It is a complete understanding of the universe, why it is as it is and why it exists at all.

Only a life lived for others is a life worthwhile.

Instead of wondering when your next vacation is, maybe you should set up a life you don't need to escape from.

We should seek the greatest value of our action.