My mind is living on cloud nine and this 9 is never on vacation
Kendrick’s mind is in a state of happiness but his 9 mm handgun works overtime and never takes a day off. Despite his good feelings, the reality of his life is always grounded.
(On a side note Kendrick made a song called “Cloud 10”)
This line might be related to the 1st one too, Kendrick is living his dream and reaching his goal, he feels so good that his mind is in a state of happiness, but there is struggle everywhere. The human contradiction (good/evil, red pill/blue pill) once again.
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