“Probably the greatest difference among men is this difference in habits of thought. There are some minds which behave merely like the mechanic who having learned his trade in a certain way never can function in any other.”
Source: Psychology: What it has to Teach You about Yourself and Your World (1924), p. 83
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Everett Dean Martin 58
1880–1941Related quotes
“I'd have to say no, people don't change, but they can learn to behave differently.”
Source: Dead Reckoning

13 January 1857 (p. 339)
1831 - 1863, Delacroix' 'Journal' (1847 – 1863)

Source: Why Men Earn More (2005), p. xvii.
Cited in: " Bachelor of Arts in Liberal Studies: What is Liberal Studies? http://scs.georgetown.edu/departments/4/bachelor-of-arts-in-liberal-studies/department-details.cfm#f2" on georgetown.edu about bachelor of arts in liberal studies, 2013.
The liberal arts and the art of management (1987)
Generation of Greatness (1957)
Context: I believe that each young person is different from any other who has ever lived, as different as his fingerprints: that he could bring to the world a wonderful and special way of solving unsolved problems, that in his special way, he can be great. Now don't misunderstand me. I recognize that this merely great person, as distinguished from the genius, will not be able to bridge from field to field. He will not have the ideas that shorten the solution of problems by hundreds of years. He will not suddenly say that mass is energy, that is genius. But within his own field he will make things grow and flourish; he will grow happy helping other people in his field, and to that field he will add things that would not have been added, had he not come along.