what does the bible say?
“Eternal generation” is a doctrinal way of expressing what Scripture teaches about the eternal relationship between the Father and the Son. The Bible says Jesus is fully God, equal with the Father (John 1:1). Yet, He is also eternally radiating “from” the Father (Hebrews 1:3). That “radiance” language, as well as passages that call Jesus “begotten,” is what theologians mean by “generation.”
Scripture repeatedly uses the family terms “Father,” “Son,” and “begotten” (i.e., John 1:14, 1:18, 3:16) to communicate a real relationship between them. Because we are incapable of comprehending how the Son can be both truly a Son and yet eternal, theologians borrow the human language of a father begetting a son. In that sense, one can say the human father “generates” his son. Indeed, “begetting” is a core definition of the relationship between a human father and his son. However, unlike the human illustration, the Bible insists that the Son is the eternal Creator (John 1:3 and Colossians 1:16–17) but not a creation Himself. So, theologians use the word “generation” to explain the genuine father-and-son relationship of the Father and Son in human terms, while adding “eternal” to clarify that they are not saying the Son had a beginning.