“A Man who is Master of Patience, is Master of everything else.”

Voluntary Action (1948) Ch. 12

On Juche in Our Revolution vol. 2 (1977)

Reported as frequently quoted but unverified in Respectfully Quoted: A Dictionary of Quotations (1989), which states, "it cannot be found in the official writings and pronouncements of Bismarck. It is possible that he said it, and it was passed on orally rather than being recorded, or that he expressed the sentiment in other terms and the idea took this form as others tried to quote him".
Disputed

26 October 2011 https://twitter.com/gtdguy/status/129326605360316416
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X, 25
Meditations (c. 121–180 AD), Book X
Context: He who flies from his master is a runaway; but the law is master, and he who breaks the law is a runaway. And he also who is grieved or angry or afraid, is dissatisfied because something has been or is or shall be of the things which are appointed by Him who rules all things, and He is Law, and assigns to every man what is fit. He then who fears or is grieved or is angry is a runaway.

Source: A Fistful of Charms

Classical Japanese Database, Translation #41 http://carlsensei.com/classical/index.php/translation/view/41 of a Saga Diary excerpt (Translation: Robert Hass)
Statements
Context: It rains during the morning. No visitors today. I feel lonely and amuse myself by writing at random. These are the words:
Who mourns makes grief his master.
Who drinks makes pleasure his master.