Right, the Logos is a person, and he is not he Father. But he is God, and he is eternal. "In the beginning was the Word." Going back to Genesis, there is nothing "in the beginning" except God. Scripture speaks of no moment in which the Logos was created, but it does say that the Word "was" in the beginning, that the Word was "with" God, and that the word "was" God. This points to an eternal person coexistent with the Father.