Scripture Commentary Hebrews 5

How is this epistle a warning to those that try to mix works and Grace? Who is this warning meant for? What is the proof that Christ Jesus is the Son of God? How is Christ a Priest after the order of Melchizedek and not the order of Aaron? What does it take to 'hear' God's Word? How does this show that the correct interpretation of Scripture is always the one that gives all glory to God through Christ?