تعریف و معنای "master of {one's} own (fate|destiny)"

What is the origin of the idiom "master of one's own fate" and when to use it?

The origin of the idiom "master of one's own fate" can be traced back to the influential poem "Invictus" by William Ernest Henley, published in 1875. The poem, with its powerful and uplifting verses, celebrates the indomitable human spirit and the ability to persevere in the face of adversity. The line "I am the master of my fate, I am the captain of my soul" encapsulates the essence of personal responsibility and self-determination.