Cause I ain't got the money on me right now
The literal reading of this line could be referring to the time before Kanye blew up before he became the persona he is now, money was tight.
A more figurative reading is that Kanye wants something that doesn’t have a price (“priceless”) therefore he can never have enough money to buy it i.e.– he can’t buy happiness or his mother back.
This line says so much in so few words. Kanye just said that all he wants is what he can’t buy now. He is aware that no amount of wealth will be able to buy him what he really wants—true love it seems, by the rest of the lyrics. But then he says, “cuz I ain’t got the money on me right now.” So, having realized that money can’t buy him love he immediately regresses and blames his absence of love on not being able to afford it. This juxtaposition between profound truth and base misunderstanding is a recurrent theme throughout this song.
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