We cannot solve our problems with the same thinking we used when we created them.

If A is success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut.

A person who never made a mistake never tried anything new.

Peace cannot be kept by force. It can only be achieved by understanding.

Try not to become a man of success, but rather try to become a man of value.

Anyone who doesn’t take truth seriously in small matters cannot be trusted in large ones either.

If you can’t explain it simply, you don’t understand it well enough.

Imagination is more important than knowledge. For while knowledge defines all we currently know and understand, imagination points to all we might yet discover and create.