Hebrews 7 clarifies a problem I had in chapter 4 abou high priests having to offer sacrifices for their own sins. Chapter 7 makes it clear that Jesus, being holy and blameless, was not so encumbered. Therefore his sacrifice on our behalf was wholly acceptable to God.
But it still leaves unclear the phrase about Jesus "learning obedience" through suffering.
I need to look up this Melchizedek character, too. Verse 3 describes him as "Without father or mother, without genealogy, without beginning of days or end of life, like the Son of God he remains a priest forever."