Each generation has its few great mathematicians, and mathematics would not even notice the absence of the others. They are useful as teachers, and their research harms no one, but it is of no importance at all. A mathematician is great or he is nothing.

Exaggerated sensitiveness is an expression of the feeling of inferiority.

If ever we hear a case of lying, we must look for a severe parents. A lie would have no sense unless the truth were felt as dangerous.

It is the individual who is not interested in his fellow men who has the greatest difficulties in life and provides the greatest injury to others. It is from among such individuals that all human failures spring.

It is the patriotic duty of every man to lie for his country.

Life happens at the level of events, not words.

Man knows much more than he understands.

The chief danger in life is that you may take too many precautions.

The feeling of inferiority rules the mental life and can be clearly recognized in the sense of incompleteness and unfulfillment, and in the uninterrupted struggle both of individuals and humanity.

The greater the feeling of inferiority that has been experienced, the more powerful is the urge to conquest and the more violent the emotional agitation.