What should believers focus on instead of Jesus' earthly ministry?

Les explains that the text says, “Yea, though we have known Christ after the flesh, yet now henceforth know we Him no more.” He is no longer attached to Christ’s earthly ministry or concerned about what He did in the flesh. This shakes people because they like to spend all their time talking about His earthly ministry, the miracles, and His walking on the water. That is interesting, but it does not get down to the nitty-gritty of the sinner’s need; it simply proves He was who He said He was. Instead, believers are not to concern themselves that much with the earthly ministry, but rather with the work of the cross. That is where everything comes to a head. This is exactly opposite to what most people in Christendom are doing: spending all their time in the four Gospels, in His earthly ministry, and falling short of the fact that this Jesus who performed the miracles died the death that had to be died, shed the blood that had to be shed, and rose in power over sin and Satan and everything against us. Now He is ready to impart it to us if we simply believe. People say they must do this or that, but God says no; Romans 4 says He saves the ungodly.