Herodotus (5th century BCE) – Histories (Book 2.42)

"The Egyptians call their highest god Amun, whom the Greeks identify with Zeus. For it is their belief that he is the ruler of all and the father of gods and men."

Corpus Hermeticum – Asclepius and Poimandres (2nd century CE)

"God is eternal and invisible, but the Logos by which he creates is light and sound, the mind of God Himself."

"Zeus is the Logos through which all things are governed."

(Temple of Karnak, various inscriptions)

"Amun, who made all things, who created what is, the father of the gods, who made men and formed all beings, the hidden one in the heavens, the Lord of the Thrones of the Two Lands."

“Ram-horned one, whose thunder shakes not the sky but the soul,
you are the deep breath of the world, the hidden sun that shines within all minds.”
— Orphic Priest of Thebes

“Amun is the name the desert gave you, Zeus is the name the mountains echo.
But neither name is your root — you are the source of names, the voice before speech.”
— Fragment of Synesius of Cyrene

Hail Zeus-Amun!

“Zeus is the first, Zeus is the last; Zeus is the head, Zeus the center. From Zeus all gods are born and to Zeus all return.”

— Orphic Fragment 167 (Kern)

"For man, as these writings affirm, has two souls. The one is from the First Intelligence and is participant of the power of the Creator, but the other is given from the revolutions of the worlds of the sky, to which the God-beholding soul returns."

— Iamblichus