Not knowin' that my color, was out of the original
So now I sing the new negro spiritual

from Common – Book of Life Lyrics on Rap Genius

Meaning

aside from continuing the commentary of the last line, it’s a sociological commentary:

by getting older and wiser, the narrator now understands what it means to be black in America more deeply and has a ‘new song,’ so to speak.

this is also a pretty huge compliment to Bob Marley and the Wailers, who performed the song he’s referencing in the next few lines.

(before he reveals which ‘spiritual’ he’s referring to though, the line before in conjunction with the phrase ‘new negro spiritual’ sets up a link between common’s disparate themes of racial identity/conflict and spirituality on its own).

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