You said, "What'd you choose me for?"
Don't ever wonder
Cause you deserve the best
Once you reach the top
You'll never question why you left
My world is yours

from John Legend (Ft. Teyana Taylor) – Bliss Lyrics on Rap Genius

Meaning

The World is Yours
~Tony Montana

For more on info on owning the world, refer to Nas’s The World Is Yours.

“Once you reach the top you’ll never question why you left” may refer to the struggle to ‘make it’ in the music industry; Legend is saying that although it is long and tedious, it is worthwhile.
May also be referring to leaving behind family/hometown. Although it was good back then, the destination will be better

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