“The second experiment, with four leaders, makes possible a comparison of the authoritarianism and democracy of four different leaders, and the "laissez-faire" method of two different leaders. In two cases it is also possible to compare the same atmosphere, created by two different leaders with the same club. One other type of control seemed very important, the nature of the club activity, and the physical setting…”
Source: 1930s, Patterns of aggressive behavior in experimentally created “social climates”, 1939, p. 272.
Help us to complete the source, original and additional information
Kurt Lewin 48
German-American psychologist 1890–1947Related quotes
https://thenationonlineng.net/ezinne-akudo-anyaoha-dont-think-world-owes-anything/amp/ Ezinne Akudo speaking at an interview

As cited in: M.K. Smith (2001) " Kurt Lewin, groups, experiential learning and action research http://www.infed.org/thinkers/et-lewin.htm". In: The Encyclopedia of Informal Education.
1940s, Resolving social conflicts; selected papers on group dynamics, 1948

Aphorism (1937), p. 38
Attributed in posthumous publications, Albert Einstein: The Human Side (1979)
Context: Body and soul are not two different things, but only two different ways of perceiving the same thing. Similarly, physics and psychology are only different attempts to link our experiences together by way of systematic thought.

“The greatest contribution of a leader is to make other leaders.”
Source: Find Your Why: A Practical Guide for Discovering Purpose for You and Your Team