All returns in life, whether in wealth, relationships, or knowledge, come from compound interest.
The keyword here being KNOWLEDGE.
By observation, I've realised any material - book, audio or video, I find life-changing, when I go back to it I find new things.
That taught me one way to gain depth "Look at it again".
Then I stumbled on the Naval Ravikant's quote above. I guess "looking at it again" is just basic compound interest.
Two things happen when you do this;
i) The life experience you have gained since your first encounter with the material makes the second, or the Nth consumption more insightful
ii) The words or phrases you glossed over the first time are spotted during another consumption of it.
For programmers, programming languages documentations are the easiest examples of these. You never see everything once, so you go back to it again.
We ought to keep this attitude for vital materials we can call life-changing.
These materials could change as we move through various stages in life.
Here are some materials, I've been returning to for the past couple of months;
1) Sam Altman - How to be successful
2) Sam Altman - The days are long but the decades are short
3) Naval Ravikant - How to get rich (without getting lucky). The tweetstorm and the podcast that expounds on it.
4) James Clear - Atomic Habits
Do you have any of such materials you come back to often?
Please share as a comment or reply.