[HarleyD]

"If the Spirit indwelt at baptism, and Jesus was led all His life, then what changed, if anything, in the relationship? I know it's a big deal for us when the Spirit indwells, I'm just not sure of the mechanics of what it meant for Christ."

An excellent question and one that I'm puzzled by. I'm not sure but I think John Calvin's answer is the best:

It was then, for the first time, that the Spirit was seen descending on him; not that he had formerly been destitute of him, but because he might be said to be then consecrated by a solemn rite. For we know that he remained in concealment, during thirty years, like a private individual, because the time for his manifestation was not yet come; but when he intended to make himself known to the world, he began with his baptism.

John Calvin's Commentary - John 1

[jo kus]

It was then, for the first time, that the Spirit was seen descending on him; not that he had formerly been destitute of him, but because he might be said to be then consecrated by a solemn rite. For we know that he remained in concealment, during thirty years, like a private individual, because the time for his manifestation was not yet come; but when he intended to make himself known to the world, he began with his baptism.

Pretty much. I would say it is a sign meant for those who are regenerated. Jesus did no great visible works until the sign of the Spirit came upon Him and His ministry began. So, too, the Christian who abides in the Spirit of Christ. While some heretics see this as a proof of adoption of Jesus into the Godhead at this point, we realize that the Spirit was in Christ all along.

Regards

[Forest Keeper]

[From Calvin's Commentary:] "It was then, for the first time, that the Spirit was seen descending on him; not that he had formerly been destitute of him, but because he might be said to be then consecrated by a solemn rite. "

Thanks Harley, that helps. I think I also read somewhere that the Baptism was sort of legally required to make Him an "officially" recognized priest. Not sure about that one though. :)