You need peace of mind? Here's a piece of mine
All I need's a line

from Eminem – Rabbit Run Lyrics on Rap Genius

Meaning

Eminem puts his thoughts and emotions into his music, and he can assure you (so you can have “peace of mind”) that he is the best — all he needs to do is spit out a line and give us a “piece of his mind”

There is also a possible double entendre here. Em may want the listener to be able to interpret “line” as a line of a rap or a line of cocaine. Perhaps he needs a line of coke before he can share how he feels about how insane he is.

Two homophone rhymes here with “(i)peace of (ii)mind” and “piece of mine”.

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