Think of the Law as an extension lead that is plugged into the power of Heaven. The Gospel is like a light bulb. It is dead without the Law, in that by itself, it gives no light to the darkened mind of a sinful world. Their understanding is "darkened, being alienated from the life of God through the ignorance that is in them because of the blindness of their heart."(Ephesians 4:18) However, once the Gospel is connected to the Law, it becomes the power of God to salvation. This was the case with the Jews on the Day of Pentecost, with Nathaniel, and with Nicodemus. Until the Law gives the light of understanding, the cross is foolishness to a world that sits in darkness. The god of this world has blinded their minds "lest the light of the glorious Gospel of Christ, who is the image of God, should shine to them."(2 Corinthians 4:4) There goes another minute. Gone forever. Go share your faith while you still have time.