Bet it on black and pray, I quadruple my salary
If I win, maybe then I could pay Sallie Mae

from J. Cole – Cole World Lyrics on Rap Genius

Meaning

He will play roulette and bet all his money on black. If he wins, then he will have enough money to pay off his student loans that he took out through the money-stealing demon known as Sallie Mae. While Cole had an academic scholarship to St. John’s University, apparently he still has loans to pay off..

By betting on a colour with roulette you will only get double the amount you’ve put in. Cole quadruples because he is black himself. Therefore he implies that he is also betting on himself to succeed.

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