And since no good deed go unpunished
I'm not as cool with niggas as I once was

from Drake (Ft. Jay Z) – Light Up Lyrics on Rap Genius

Meaning

Since his good deeds in the past have done him no good, he doesn’t do good deeds anymore

The problem is: when you do people favors — instead of appreciating it — they come to expect it

As Lil Wayne says: you feed people, and pretty soon they are complaining that you’re out of mustard!

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