No victor believes in chance.

[Kein Sieger glaubt an den Zufall.]

Friedrich Nietzsche (1844-1900) German philosopher and poet

The Gay Science [Die fröhliche Wissenschaft], Book 3, § 258 (1882) [tr. Kaufmann (1974)]
    (Source)

Also known as La Gaya Scienza, The Joyful Wisdom, or The Joyous Science.

(Source (German)). Alternate translations:

No conqueror believes in chance.
[tr. Common (1911)]

No victor believes in chance.
[tr. Nauckhoff (2001)]