I know that many verses can be cited to argue for Jesus' pre-mortal existence (e.g. here). I'm also perfectly aware that a question asking for the biblical basis for Jesus being God incarnate has already been asked. However, I want to defend the validity of this question on the grounds of the following reasons:
- Pre-mortal existence does not logically entail eternal pre-existence. In principle, if the only thing we know about a being is that it had a pre-mortal existence, then we cannot rule out a priori the possibility that that being could still have had a beginning in the past, either recently or a long time ago (e.g. see the viewpoint of Jehovah's Witnesses on the nature of Jesus).
- Eternal pre-existence does not logically entail being God (or does it?). In addition to being eternal, a being needs to be omniscient, omnipotent, and many other things to be regarded as God. So I don't see the two as equivalent statements, although I acknowledge that there is a clear overlap.
Having presented my reasons for asking the question, I ask: What is the biblical basis for Jesus having eternal pre-existence? Are there passages in Scripture that strongly suggest that Jesus never had a beginning in time?