“For honest merit to succeed amid the tricks and intrigues which are now so lamentably common, I know is difficult; but the honor of success is increased by the obstacles which are to be surmounted. Let me triumph as a man or not at all.”

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.

Letter to his uncle, Joseph Fesch (June 1791), as quoted in A Selection from the Letters and Despatches of the First Napoleon. With Explanatory Notes (1884) edited by D. A. Bingham, Vol. I, p. 24

Source: The Joke

On Democracy (6 October 1884)
Context: Few people take the trouble of trying to find out what democracy really is. Yet this would be a great help, for it is our lawless and uncertain thoughts, it is the indefiniteness of our impressions, that fill darkness, whether mental or physical, with spectres and hobgoblins. Democracy is nothing more than an experiment in government, more likely to succeed in a new soil, but likely to be tried in all soils, which must stand or fall on its own merits as others have done before it. For there is no trick of perpetual motion in politics any more than in mechanics.

Peace and the Public Mind (1935)

During the final confrontation in which he was fatally wounded, as quoted in Indian Heroes and Great Chieftains (1919) by Charles Alexander Eastman

Many Mansions Chapter 20 - A Philosophy of Vocational Choice
Cayce answered this to another financial related question In what field of endeavor am I most likely to succeed financially?
On Vocational Choices

Napoleon : In His Own Words (1916)
Variant: It is only by prudence, wisdom, and dexterity, that great ends are attained and obstacles overcome. Without these qualities nothing succeeds.

"The Triumph of the Soul" as translated by Margaret Smith in The Persian Mystics
Context: Joy! Joy! I triumph! Now no more I know
Myself as simply me. I burn with love
Unto myself, and bury me in love.
The centre is within me and its wonder
Lies as a circle everywhere about me.
Joy! Joy! No mortal thought can fathom me.