Let's say that being part of a 'generation' or being 'begotten' or even 'the first born', each included a time period when they had not yet begun to be 'generated' or 'begotten' or where they experienced a time of 'pre-birth', prior to being 'born', then in the case of Jesus, it would be teaching that He actually wasn't always in the Same Nature and Essence as God the Father, and, therefore, not God.
However, The Bible teaching using that same word 'always', describes Jesus as Eternally Existing AS HAVING ALWAYS BEEN GENERATED.
That is what The Bible teaches about Jesus' Eternal Generation.
You've seen it before.
Obviously, 'Wisdom' is Jesus Christ Whom the Lord possessed in the beginning of His Way, or that would be from Eternity Past;
Proverbs 8:
22 The LORD possessed me in the beginning of his way, before his works of old.
23 I was set up from everlasting, from the beginning, or ever the earth was.
24 When
there were no depths, I was brought forth; when
there were no fountains abounding with water.
25 Before the mountains were settled, before the hills was I brought forth:
26 While as yet he had not made the earth, nor the fields, nor the highest part of the dust of the world.
27 When he prepared the heavens, I
was there: when he set a compass upon the face of the depth:
28 When he established the clouds above: when he strengthened the fountains of the deep:
29 When he gave to the sea his decree, that the waters should not pass his commandment: when he appointed the foundations of the earth:
30 Then I was by him,
as one brought up
with him: and I was daily
his delight, rejoicing always before him;
Now, if you would, try and absorb there in verse 30,
where the last part says, "I was daily His delight, rejoicing always before Him".
What does the word 'always' mean to you there?
Does that teach us that Jesus was 'always' Eternally Generated, to 'always' have been possible for Him to, again, 'always' have rejoiced before God the Father?
If so, then there has never been a concept of a time before Jesus began to be Generated or begotten.
Jesus is the Express Image of God the Father, which Image He has 'always' had.
Jesus has Existed as being Generated from God the Father,
as long as their has been Eternity.
Because, Jesus was daily God the Father's delight, from Eternity Past,
since Jesus has been "rejoicing always before Him.
That's it. That's Bible.
Eternal Generation- Jesus is eternally YHWH, co-equal with the Father, no beginning and no end.
The point is that, while there is a point in time that the Word became flesh, the Word existed eternally with and as God.