They’re just there to keep you
Cause in the future they might creep up on you and say they need you
For reasons thats so dark inside its not exactly see through

from Lupe Fiasco (Ft. Rilo & Skylar Grey) – Words I Never Said (Remix) Lyrics on Rap Genius

Meaning

This is saying that he believes school is there just to keep you off the streets and brain wash you, so when the higher power needs you (the government) you’ll be filled up with lies and ready to tend to their every need. A good example is Voting
A perfect moment where the government needs you, to “pick your poison”

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