There is joy in work. There is no happiness except in the realization that we have accomplished something. 

I feel exhausted if I teach too long.

I think technology really increase human ability. But technology cannot produce compassion.

It is better to conquer yourself than to win a thousand battles. Then the victory is yours. It cannot be taken from you, not by angels or by demons, heaven or hell.

Compromise is not such ignoble and deplorable a thing as we generally think. It is rather an indispensable factor in the political strategy. Any nation that rises against the oppressors is bound to fail in the beginning and to gain partial reforms during the medieval period of its struggle through compromises.

I believe that a man is the strongest soldier for daring to die unarmed.

If you want to increase your success rate, double your failure rate. 

Eating words has never given me indigestion. 

What we think, we become.

We made the buttons on the screen look so good you'll want to lick them.

The high destiny of the individual is to serve rather than to rule.

Thinking is the hardest work there is, which is probably the reason why so few engage in it.