“It matters not how strait the gate,
How charged with punishments the scroll,
I am the master of my fate:
I am the captain of my soul.”

This may have inspired later lines of "A Challenge" from "Quatrains" by James Benjamin Kenyon, published in An American Anthology, 1787-1900 (1901) edited by Edmund Clarence Stedman:
Arise, O Soul, and gird thee up anew,
Though the black camel Death kneel at thy gate;
No beggar thou that thou for alms shouldst sue:
Be the proud captain still of thine own fate.
Invictus (1875)