Many gon' come, many gon' go
Only time'll tell, only God knows
As mentioned in the intro of the song, Ab said that he isn’t Christ/God. In this line he’s referencing the Prophets of God and the times they come. This is where he mentions that only God knows when said prophets will come. He says many people are going to come and go, but it is God who knows when the prophets will come.
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