Gemini suggested some: "Seek first to understand, then to be understood", "Let go of judgment", "My goal is progress, not perfection or judgment" and so on. Sounds fine as virtue garnishes for your whisper.
Oh, I didn't realize your OP was actually a satire. I intentionally ignored that part because well, you can always take whatever meaningful informations out of anything including stupidly apparent ads. As the other comment said, the whisper part is a well-known strategy as well.
You genuinely read this ad and think there's something to be learned?
If I take this concept seriously for a few seconds, it's one massive exercise in begging the question. The argument boils down to "notice when you do something wrong" while simultaneously admitting that people don't do that. And the ad's advice for doing it? Do it. What?!
That's profoundly stupid as a concept, where "profoundly stupid" here is defined specifically as an argument with a clear reasoning issue.
You know one great way to stop smoking? By stopping. OP is stealing Bob Newhart's bit:
If you want to reinforce your current beliefs do the opposite. Write nothing down. Do what comes to your mind first. You do you.
If I had a garnish that turned anything objectively stupid into something that has objective value it would probably revolutionize chain-of-thought reasoning.
What would a virtue garnish be for that?