The clear is self-clear, and the turbid is self-turbid. I am depressed and flawless. How can I be defiled by the blue fly?
Meaning: Innocent means innocent, and dirty means dirty. I am a flawless white wall (jade). How can I be defiled by this black fly?
Note: Innocent refers to the flawless white wall (jade). The blue fly refers to blackfly.
White jade and flies are metaphors of loyalty to good and evil.