Hebrews 7:20-25 Guarantor & Intercessor

Jesus is the guarantor of a better covenant, who is able to save to the uttermost those who draw near to God through him, since he always lives to make intercession for them. Why is Jesus a better priest than any other?  I. Because of God's oath, vv20-21. II. Because he's the guarantor of a better covenant, v22. III. Because he always lives to intercede for us,, vv23-25.