Out of the blue

Funnily enough, I find that most of the time I truly learnt something, is when I am reprimanding someone.
Though we often defend that we are learning all the time, but most of the time we are only seeing and hearing.
Message just pass by the brain but not significant enough for it to etch into our brain.
Do you feel the same way, too?

This reminds me of another thing, walk the talk. Sometimes, when we hear nagging too much, we often would mumble to ourselves that should let the speaker be in our shoes, to see from our perspective, and not just bragging off on what is the best practice.
If the one is to be in the same shoe, would the nagging still be the same?