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  4. Ashley Montagu
  5. ... the main principle by which human beings must guide the ...

... the main principle by which human beings must guide the future course of their development is love.

Ashley Montagu
Principles, Development, Guides
Ashley Montagu (1970). “The Direction of Human Development”, New York : Hawthorn Books
... the main principle by which human beings must guide the future course of their development is love.