Final answer:
In The Epic of Gilgamesh, Utnapishtim reveals to Gilgamesh that the gods did not intend for humans to have immortality, teaching him to accept his own mortality and embrace his role as a mortal king.
Step-by-step explanation:
The 'mystery of the gods' that Utnapishtim revealed to Gilgamesh is a crucial element in The Epic of Gilgamesh, an ancient Mesopotamian text that explores deep philosophical questions such as the nature of leadership, friendship, human weaknesses, fate, and the quest for immortality. In the narrative, Gilgamesh, after the death of his friend Enkidu, embarks on a journey to find Utnapishtim, the only human granted immortality by the gods, in hopes of discovering the secret to eternal life. However, Gilgamesh learns that the quest for immortality is futile and that the gods have not intended for humans to live forever. This revelation is a profound part of Gilgamesh's journey as he comes to understand his own mortality and the eventual acceptance of it, leading to his return to Uruk where he applies the wisdom gained to become a better leader.