Article 10: Jesus Christ is True and Eternal God.
We believe that Jesus Christ, according to His divine nature, is the only begotten Son of God, begotten from eternity, not made nor created (for then He should be a creature), but coessential and coeternal with the Father, the express image of His person, and the brightness of His glory, equal unto Him in all things. He is the Son of God, not only from the time that He assumed our nature, but from all eternity, as these testimonies, when compared together, teach us. Moses saith that God created the world; and John saith that all things were made by that Word, which he calleth God. And the apostle saith that God made the worlds by His Son; likewise, that God created all things by Jesus Christ. Therefore it must needs follow that He who is called God, the Word, the Son, and Jesus Christ did exist at that time when all things were created by Him. Therefore the prophet Micah saith: His goings forth have been from of old, from everlasting. And the apostle: He hath neither beginning of days nor end of life. He therefore is that true, eternal, and almighty God, whom we invoke, worship, and serve.
 
Five New Testament Texts Calling Christ the “Only Begotten” Son
John 1:14: “And the Word was made flesh, and dwelt among us, (and we
beheld his glory, the glory as of the only begotten of the Father,) full of grace
and truth.”
John 1:18: “No man hath seen God at any time; the only begotten Son, which
is in the bosom of the Father, he hath declared him.”
John 3:16: “For God so loved the world, that he gave his only begotten Son,
that whosoever believeth in him should not perish, but have everlasting life.”
John 3:18: “He that believeth on him is not condemned: but he that believeth
not is condemned already, because he hath not believed in the name of the
only begotten Son of God.”
I John 4:9: “In this was manifested the love of God toward us, because that
God sent his only begotten Son into the world, that we might live through
him.”