I ain't sayin' that I'm harder, it's just harder when it's in Lupe's hands

from Lupe Fiasco – SLR 2 Lyrics on Rap Genius

Meaning

He’s saying that he’s not necessarily harder (in meaning thugish) than Kendrick (Who is perceived as, you know, Good Kid), but whenever he begins to talk about a concept in his songs, he goes harder, as in better, than most rappers, and people have a hard time comprehending where he’s getting at because of the way he goes upon the topic of discussion. He is RapGenius™ King of Lyrical Trickiness and Proust of Rap.

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