The people close to me say that I’m in need of a doctor
Think that I got a problem but these are not apostles

from Macklemore and Ryan Lewis (Ft. Allen Stone & Macklemore) – Neon Cathedral Lyrics on Rap Genius

Meaning

People around him trying to help him but he refuses, as he doesn’t believe normal guys like him could make any change. Who are you, to confuse me?!

His family and friends tell him that he needs to get help from a therapist (doctor), a professional who knows how to help him get past his addiction. They think that he has a serious problem, but they are not “apostles” in his religion, meaning that they are not followers and thus he feels like they don’t understand what alcohol (“The drink of the Lord”) means to him. For this reason he chooses to ignore them.

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