The Mediator of a New Covenant

We live in the New Covenant today as believers in Jesus Christ. When did this covenant take effect? On the death of Christ. His death is the pivot point. Hebrews explains this in Hebrews 9:15-22 "For this reason Christ is the mediator of a new covenant, that those who are called may receive the promised eternal inheritance ..." Richard talks about the highest calling of the Christian life - loving others.If God is not faulty, and does not make mistakes, how do you explain Satan? If God knew before he even created Lucifer that he was going to go astray, that means he created Lucifer to take the fall.La Vonna asks for clarification on the beginning of the New Covenant.