Read this excerpt from "The Big Shot." You can't tell yourself what to see. The world presents itself to you and you think that you're seeing it the way that it is, and even if you tried to change your perception, you're not going to be able to."

This is a gentle warning to athletes everywhere: While you may now better understand your bad days, you’re still going to have them.

Which phrase in the excerpt most reflects the writer's humorous tone?

"change your perception"
"gentle warning"
"athletes everywhere"
"better understand"