Nītiśataka 74; translated by B. Hale Wortham
Śatakatraya
“Agreeable men are those who are interested in everything; men who accomplish things, who finish their tasks, are those who, during a given period of time, interest themselves in one thing only. In America these men are said to possess "single-track minds"' their tenacity and their obsession are sometimes boring, but they succeed, by repeated attacks, in demolishing the obstacles that hinder their progress.”
Un Art de Vivre (The Art of Living) (1939), The Art of Working
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André Maurois 202
French writer 1885–1967Related quotes

No. 388
Characteristics, in the manner of Rochefoucauld's Maxims (1823)

Source: Problems Of Humanity (1944), p. 13

Five Essays on Liberty (2002), Introduction (1969)
Context: Those, no doubt, are in some way fortunate who have brought themselves, or have been brought by others, to obey some ultimate principle before the bar of which all problems can be brought. Single-minded monists, ruthless fanatics, men possessed by an all-embracing coherent vision do not know the doubts and agonies of those who cannot wholly blind themselves to reality.

“The men who cannot laugh at themselves frighten me even more than those who laugh at everything.”
Source: The Whitechapel Conspiracy

“Men who can succeed in deceiving no one else will succeed at last in deceiving themselves.”
Miss Mackenzie, Ch. 13. (1865) · Project Gutenburg e-text http://www.gutenberg.org/etext/24000

1880s, Garfield's Words (1882)
Casanova: History of My Life (p. 153)
Classics Revisited (1968)