It wasn't until late teens/early twenties that lots of those piece of wisdom went from "cliché phrases you've heard all your life", to (often) deeply impactful aspect of human conditions.
The "road to hell" idiom explicitly didn't click until I had enough experience with counter-productive efforts who looks good on the outside, but actually fail to take into account a more nuanced reality.
It also kinda works with the distinction between "values I believe in" and "arguments articulated around shared values". Being able to disagree on something even when (especially when) it's invoking values I believe in is one of the most important thing I've gained as I matured, and yet it needs experience to 'click'.