Challenge can be an important source of self-knowledge, since those who pay attention to how they react, both emotionally and physically, to challenge can gain useful insights into their own weaknesses.
Principle
Paying attention to gain insights important how we emotionally ⇢ into our own ⇢ source and physically react weaknesses of self to a challenge knowledge
Evaluate
Usually when we're given a principle and asked to apply it, the principle is phrased like a conditional rule.
But this one doesn't seem like that. It's actually written more like an argument. We're representing it above as a chain of causality / reasoning.
Goal
Let's look for something where people are challenged, they pay attention to how they react, emotionally and physically, to the challenge, and learn something about their own weaknesses / broaden their self knowledge.