A man may fulfil the object of his existence by asking a question he cannot answer, and attempting a task he cannot achieve.

The ultimate value of life depends upon awareness and the power of contemplation rather than upon mere survival.

Count your age by friends, not years. Count your life by smiles, not tears.

Keep silence for the most part, and speak only when you must, and then briefly.

Progress is impossible without change, and those who cannot change their minds cannot change anything.

The only thing worse than being blind is having sight but no vision.

The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.