Strength

At the very beginning of the book, Enkidu was full of courage and strength, believing he could not be defeated. This is why he accepted the challenge against Gilgamesh, but in the end he was defeated. This is a very common happening in the lives of many, a moment where you feel completely powerfull, like if nothing can bring you down, but soon enough you learn that in fact, it can be over. Moments like these are wonderful, you feel inmensely happy, but the low moments are also part of life, so you just have to learn to be able to pick yourself up whenever there is a low point and wait for the good moments to come.