It is curious that physical courage should be so common in the world and moral courage so rare.
Let not the sands of time get in your lunch.
You create your opportunities by asking for them.
To err is human, but to really foul things up requires a computer.
The release of atomic energy has not created a new problem. It has merely made more urgent the necessity of solving an existing one.
Never read a book through merely because you have begun it.
The freedom of all is essential to my freedom.