“There has to be this pioneer, the individual who has the courage, the ambition to overcome the obstacles that always develop when one tries to do something worth while, especially when it is new and different.”

Herbert N. Casson in: National Printer Journalist Vol 51 (1933), Nr. 7-12. p. 28; Cited in Arthur Tremain (1951) Successful Retailing: A Handbook for Store Owners and Managers p. xi
1920s-1940s

Variant: Success is not measured by the position one has reached in life, rather by the obstacles one overcomes while trying to succeed
Source: 1900s, Up From Slavery (1901), Chapter II: Boyhood Days
Source: Up From Slavery: An Autobiography
Context: I have learned that success is to be measured not so much by the position that one has reached in life as by the obstacles which he has overcome while trying to succeed. Looked at from this standpoint, I almost reached the conclusion that often the Negro boy's birth and connection with an unpopular race is an advantage, so far as real life is concerned. With few exceptions, the Negro youth must work harder and must perform his tasks even better than a white youth in order to secure recognition. But out of the hard and unusual struggle through which he is compelled to pass, he gets a strength, a confidence, that one misses whose pathway is comparatively smooth by reason of birth and race.

As quoted in The Magic of Teamwork (1997) by Pat Williams
Year unknown, published in 1990s

J 1770
Aphorisms (1765-1799), Notebook J (1789)

Source: The Testament of Jessie Lamb (2011), Chapter 7 (p. 46)

Reader's Digest, April 1968; and in Chip R. Bell, Managers as Mentors (1996), ISBN 1881052923, p. 171 http://books.google.com/books?id=lQGfdSy6qCYC&pg=PA171
Attributed

La difficoltà di commettere suicidio sta in questo: è un atto di ambizione che si può commettere solo quando si sia superata ogni ambizione.
This Business of Living (1935-1950)

Ἀδικεῖ πολλάκις ὁ μὴ ποιῶν τι, οὐ μόνον ὁ ποιῶν τι.
IX, 5
Source: Meditations (c. 121–180 AD), Book IX