Alfred Adler — Austrian Psychologist born on February 07, 1870, died on May 28, 1937

Alfred W. Adler was an Austrian medical doctor, psychotherapist, and founder of the school of individual psychology. His emphasis on the importance of feelings of inferiority —the inferiority complex—is recognized as isolating an element which plays a key role in personality development. Alfred Adler considered human beings as an individual whole, therefore he called his psychology "Individual Psychology" ... (wikipedia)

A simple rule in dealing with those who are hard to get along with is to remember that this person is striving to assert his superiority; and you must deal with him from that point of view.
The chief danger in life is that you may take too many precautions.
Death is really a great blessing for humanity, without it there could be no real progress. People who lived for ever would not only hamper and discourage the young, but they would themselves lack sufficient stimulus to be creative.
To be a human being means to possess a feeling of inferiority which constantly presses towards its own conquest. The greater the feeling of inferiority that has been experienced, the more powerful is the urge for conquest and the more violent the emotional agitation.
Every individual acts and suffers in accordance with his peculiar teleology, which has all the inevitability of fate, so long as he does not understand it.