A hero can never achieve eternal life. This is the greatest lesson that Gilgamesh learns in his life.
2) Gilgamesh's quest for immortality ultimately fails and this shows the message that death is inevitable and a hero can not achieve eternal life.
Immortality is an important theme in The Epic of Gilgamesh. While Gilgamesh is part God and part man, he is not immortal. He has some God like abilities but not their immortality. He is strong and fearless but the question of inevitability of death torments his mind.
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