The Son is "without beginning"

"on hearing of a Son, understand it not merely in an improper sense, but as a
Son in truth, a Son by nature, without beginning" (Cyril, Cat. Lectures 11,4)

 

"For He is the Son of David at the end of the ages, but the Son of God BEFORE ALL AGES, without beginning" (Cyril, Cat. Lectures 11,5)

"[...]to confess our ignorance is the best knowledge."

"For we explain not what God is but candidly confess that we have not exact knowledge concerning Him. For in what concerns God to confess our ignorance is the best knowledge." (Cyril, Archbishop of Jerusalem (c. 335), "Catechetical Homilies, VI §2", in Schaff, Philip, Nicene and Ante-Nicene Fathers (2nd Series), VII, Peabody, Mass.: Hendrickson Publishers, Inc., 1994, p. 33)