Books
The only reason for being a bee that I know of is making honey. And the only reason for making honey is so as I can eat it.
— Winnie the Pooh ‧ Winnie the Pooh

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker gives bees a purpose, then makes that purpose serve his own appetite. Honey-making leads straight to honey-eating, as though the whole arrangement exists for his benefit. The humour comes from the confident simplicity of that thoroughly self-centred explanation.
Context reviewed