A clean desk is a sign of an empty mind.
Wisdom begins in wonder.
You can tell whether a man is clever by his answers. You can tell whether a man is wise by his questions.
The mind has exactly the same power as the hands: not merely to grasp the world, but to change it.
No man is an island, entire of itself; every man is a piece of the continent.
A bookstore is one of the only pieces of evidence we have that people are still thinking.
The mind is not a vessel to be filled but a fire to be kindled.
When all men think alike, no one thinks very much.
Minds are like parachutes; they work best when open.
We are what we think. All that we are arises with our thoughts. With our thoughts, we make the world.