Genius is talent exercised with courage.
Whereof one cannot speak, thereof one must be silent.
Courage, not cleverness; not even inspiration, is the grain of mustard that grows up to be a great tree.
A confession has to be part of your new life.
Only when one thinks even much more madly than the philosophers can one solve their problems.
The subject does not belong to the world; rather, it is a limit of the world.