It was who said, "to be a human being means to have inferiority feelings. but in the mentally healthy person this inferiority feeling acts as a motive for productivity, as a motive for attempting to overcome obstacles, to maintain oneself in life."

Alfred Adler (1979-Superiority and Social Interest: A Collection of Later Writings)

Explanation:

Alfred Adler (February 1870 – 28 May 1937) was an Austrian medical doctor, psychotherapist, and founder of the school of individual psychology.

His studies emphasis on the importance of feelings of inferiority (the inferiority complex) is recognized as an isolating element which plays a key role in personality development.

Adler considered every human being as an individual whole, that is way he called his psychology "Individual Psychology".

He was also the first to emphasize the importance of the social element in the re-adjustment process of the individual, and the one who carried psychiatry into the community.