The sermon will lean heavily on the Romans 5:6-21 passage, which is rich with material. It addresses the symmetry between the sin of one man (Adam) leading to the death of all, and the sacrifice of one man (Jesus) leading to the salvation of all. It also addresses how the sacrifice of the Cross meets us while we were still “weak”, ungodly…enemies of God.
Also, crucially, Romans 5:8 and 1 John 3:16 both bolster the understanding that the Cross, gruesome as it may be, is the prime example of God’s love for us. We begin to understand God’s love—and what love is at all—when understand the great love God has for us by sacrificing his only Son (and how this is, in a sense, God taking upon himself our punishment.)