He who knows no foreign languages knows nothing of his own.

The experiences show us just as we are; they make us see our own defects.

If you are convinced of a matter, you must take sides or you don't deserve to succeed.

Hatred is a heavy burden. It sinks the heart deep in the breast, and lies like a tombstone on all joys.

Everything great and intelligent is in the minority

Someday someone will write a pathology of experimental physics and bring to light all those swindles which subvert our reason, beguile our judgement and, what is worse, stand in the way of any practical progress. The phenomena must be freed once and for all from their grim torture chamber of empiricism, mechanism, and dogmatism; they must be brought before the jury of man's common sense.

A man does not mind being blamed for his faults, and being punished for them, and he patiently suffers much for them; but he becomes impatient if he is required to give them up.