The next sentence has nothing to do with yourself.

"It's none of your business, hang high" from: Mao Zedong's "Against Liberalism": "It's none of your business, hang high; It's better to talk less when you know it's wrong; Protect yourself wisely, but ask for nothing else. This is the third kind. "

"It's none of your business, indifference" is a view used by modern people to describe that what you don't care about is not your business, but a mentality of sweeping away the snow in front of the door.