Good man don't exist no
No righteous man exists

from Frank Ocean (Ft. Django) – Wiseman Lyrics on Rap Genius

Meaning

It’s almost impossible for a man of righteousness and honor to exist in a world that’s full of corruption and sin.
Additionally, this is a juxtaposition to the earlier line “Good man don’t exist” because without the concept of bad the idea of good is lost. This is all a function of Ocean’s philosophy that good and bad cannot be defined by human’s as we are not fit to judge.

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