That's why your (lame) career's come to an end
It's only so long fake thugs can pretend

from Jay Z – Takeover Lyrics on Rap Genius

Meaning

Sooner or later, someone will test Nas' mettle as a “thug” and he’ll have to show if he’s for real or not: there’s no halfway crooks.

This also may be a clever play on the opening line to the Nas song “The Message”

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