Every truth has four corners: as a teacher I give you one corner, and it is for you to find the other three.
If you know how to listen, everyone is a guru.
Every man I meet is my superior in some way. In that, I learn of him.
Education is the progressive discovery of our own ignorance.
Every man who rises above the common level has received two educations: the first from his teachers; the second, more personal and important, from himself.
Anyone who stops learning is old, whether at 20 or 80. Anyone who keeps learning stays young. The greatest thing in life is to keep your mind young.
It is impossible for a man to learn what he thinks he already knows.