«Declare to me from the beginning, you Mousai who dwell in the house of Olympos, and tell me which of them first came to be».

In truth at first Khaos (Air) came to be, but next wide-bosomed Gaia (Earth), the ever-sure foundation of all the deathless ones who hold the peaks of snowy Olympos, and dim Tartaros (the Pit) in the depth of the wide-pathed Earth, and Eros (Love), fairest among the deathless gods, who unnerves the limbs and overcomes the mind and wise counsels of all gods and all men within them. 

From Khaos (Air) came forth Erebos (Darkness) and black Nyx (Night); but of Nyx (Night) were born Aither (Light) and Hemera (Day), whom she conceived and bore from union in love with Erebos. And Gaia (Earth) first bore starry Ouranos (Heaven), equal to herself, to cover her on every side, and to be an ever-sure abiding-place for the blessed gods. And she brought forth long Ourea (Mountains), graceful haunts of the goddess Nymphai who dwell amongst the glens of the hills. She bore also the fruitless deep with his raging swell, Pontos (Sea), without sweet union of love.

But afterwards he [Gaia, Earth] lay with Ouranos (Heaven) and bare deep-swirling Okeanos, Koios and Krios and Hyperion and Iapetos, Theia and Rhea, Themis and Mnemosyne and gold-crowned Phoibe and lovely Tethys. After them was born Kronos the wily.»

 — Hesiod, Theogony