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"Humanity had once been mighty; their first realm among the stars had been almost as great as the old aeldari empire, and could be so again. His people looked down on them, but he doubted his own kind had ever possessed humanity's infuriating tenacity, or their vibrancy, or shared their drive to live. There was a broad, bitter strip of cynicism in the aeldari soul. When young, Natasé had noted this. Anguished, he had sought out his elders' counsel, and they nodded sage heads, and said this came about a short time before the Fall, that it had caused the Fall, and that once the aeldari had been a pure and noble people who looked upon creation with wonder, but he wondered if his gods and ancestors were the paragons the legends insisted.
He wondered too if the aeldari, old and bitter in their fading days, had not looked upon the vitality of men and been consumed by envy."

-Dawn of Fire: The Silent King