Recent post by Sam Altman, reflecting on life lessons after turning 30. I really agree on most of these, besides having experienced a fewer number of them personally. I'm sure some change and evolve as one grows even older and starts a family.
I'd like to hold myself accountable to truly living these, by posting them here and reflecting on them once in a while. Perhaps any reader can help me out by commenting on any straying I do from these, thus making me more aware.
As I encounter more applicable principles online, I'll link them under these same tags.