What was the single most important thing I learned from 4 day no water and no food vision quest?

That I would be okay without water or food likely anywhere on earth for 4 days.

many people panic when they miss a meal and after 3 days they would totally be freaking out and possibly violent trying to get food.

Though I'm 73 years old now and everything has changed because of medicines I have to take I still don't panic if I miss a meal simply because of what I learned about myself those 4 days in 1983.

In other words: Most people are far more resilient than they presently believe.

There's a saying from a Clint Eastwood Movie: "A man's got to know his limitations" which is true if you want to continue staying alive.

But, seeing that I could last for 4 days without water or food and be okay in 1983 changed completely how I saw everything in my life forever.