If the only tool you have is a hammer, it is tempting to treat everything as if it were a nail.

Psychologists
Abraham Maslow
American psychologist (1908-1970). Father of humanistic psychology — the "third force" after psychoanalysis and behaviorism. His hierarchy of needs and self-actualization shaped management and education beyond academia.
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Abraham Maslow's Other Quotes
What a man can be, he must be. This need we may call self-actualization.
One can choose to go back toward safety or forward toward growth. Growth must be chosen again and again; fear must be overcome again and again.
A musician must make music, an artist must paint, a poet must write, if he is to be ultimately at peace with himself.
It is as if Freud supplied us the sick half of psychology and we must now fill it out with the healthy half.
Related Quotes
Emptiness wrongly grasped destroys the slow-witted, like a snake wrongly seized or a spell wrongly cast.
-- Nagarjuna
The problem with experts is that they do not know what they do not know.
-- Nassim Nicholas Taleb
Drawing is not form; it is the way of seeing form.
-- Edgar Degas
To a man with a hammer, everything looks like a nail.
-- Charlie Munger
Divide each difficulty into as many parts as possible for a better solution.
-- René Descartes
To the things themselves!
-- Edmund Husserl