Rules for life.
Let's start with two indisputable facts: First, you were born. Second, you will die. What happens in between should serve to explain the first fact before the second one happens. It doesn't always work out that way which is sad. To avoid that sadness we should all really embrace life not just living. Life is unpredictable. It's an adventure, with all that this implies.
It requires us to cultivate a specific frame of mind
where discomfort, surprises and adversity are simply part of the journey
. That, takes both intent and perseverance. Effort and discipline.