Few things are more bitter than to feel bitter.

In life, as in chess, forethought wins.

All high truth is poetry. Take the results of science: they glow with beauty, cold and hard as are the methods of reaching them.

The longer I live, the more deeply am I convinced that that which makes the difference between one person and another-between the weak and the powerful, the great and the insignificant-is energy-invisible determination.

The fact is - nothing comes, at least nothing good. All has to be fetched.

Few things are more bitter than to feel bitter.

Experience shows that success is due less to ability than to zeal.