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Grit is the grain of character. It may generally be described as heroism materialized,--spirit and will thrust into heart, brain, and backbone, so as to form part of the physical substance of the man.

Edwin Percy Whipple (1875). “Success and Its Conditions”, p.58
Grit is the grain of character. It may generally be described as heroism materialized,--spirit and will thrust into heart, brain, and backbone, so as to form part of the physical substance of the man.