Nothing could be worse than the fear that one had given up too soon, and left one unexpended effort that might have saved the world.

Deeper than the sea is the spirit of man.

The fox has many tricks. The hedgehog has but one. But that is the best of all

Set your mind on a definite goal and observe how quickly the world stands aside to let you pass.

A journey of a thousand miles begins with a single step.

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.

If you think you are too small to make a difference, try sleeping with a mosquito.