Justin's Hortatory Address To The Greeks

What does he mean by "I adjure thee by the Father's voice, which first He uttered?" It is the Word of God which he here names "the voice," by whom heaven and earth and the whole creation were made, as the divine prophecies of the holy men teach us; and these he himself also paid some attention to in Egypt, and understood that all creation was made by the Word of God; and therefore, after he says," I adjure thee by the Father's voice, which first He uttered," he adds this besides, "when by His counsel He established the whole world."