“Come now, let us reason  together, says the Lord: though your sins are like scarlet,
they shall be as white as snow; though they are red like crimson, they shall become like wool.
19 If you are willing and obedient, you shall eat the good of the land;
20 but if you refuse and rebel, you shall be eaten by the sword; for the mouth of the Lord has spoken.”
Our second portion [Isaiah 1:18-20] appeals to that intelligent part of the human nature which is given to us so that we may know God. “Come now, let us reason together,” runs one of the greatest passages in all of Isaiah. Come on, he says, let us think these things through. Let us consider things as they really are. And how are things in this relationship we truthfully have with the Almighty Creator of heaven and earth? The truth about man is a hard pill to swallow. “Though your sins are like scarlet … though they are red as crimson.” Who really wants to believe the fallen nature of our human condition? We all rebel against that assessment and enough pop psychology has been passed off as science that we all feel down right righteous even as we question how fatal is the infection of sin. Yet, if we would believe what the Bible tells us about the natural state of our soul, we might find hope in the free offer of grace outlined in this great passage from Isaiah. Remember those laundry advertisements on television, where the soiled handkerchief, sock or shirt is miraculously cleaned before your very eyes?
Well, this is the offer that the Lord is making to you. “Though your sins are like scarlet, they shall be as white as snow; though they are red as crimson, they shall be like wool.” IF! What do you mean if? “If you are willing and obedient.” Are you willing to accept the free offer of grace on God’s terms? Are you willing to learn obedience to the revealed will of God? He doesn’t ask you if you are able does He? He only asks if you are willing and obedient. Then He will bless you. But, what if you continue in rebellion, what if you decide to resist? Then your life is forfeit! You must certainly die.