Insanity: doing the same thing over and over again and expecting different results.
The keenest sorrow is to recognize ourselves as the sole cause of all our adversities.
Preserving health by too severe a rule is a worrisome malady.
The more freedom we enjoy, the greater the responsibility we bear, toward others as well as ourselves.
The release of atomic energy has not created a new problem. It has merely made more urgent the necessity of solving an existing one.
We are made to persist. That's how we find out who we are.
None are so busy as the fool and knave.