Every single being and every single thing that inhabit cognizable reality have their own moment of becoming. The cognizable reality itself has its moment of becoming, too. Everything but the Ancient Egg.
Swaying in the infinities of the Ancient Darkness wrapped up in its timeless slumber, the Egg existed without knowing it existed. No one among the old Slavs was sure what precisely happened to the Egg or whether it was possible to pinpoint when. But everyone agreed that its sway in the haze of quiescence was interrupted by the forces of life.
Of course, those were not any old forces of life, but Love. So strong was that power, Love, that it woke up the light that lay dormant within the Ancient Egg. So strong it was that it created Svarog, the progenitor of the vault of Heaven and the father of everything born under it. So great was its strength that it imbued Svarog with the ability to create as well as his progeny as well as their progeny as well as...
And Love saw that it was good.