Leprosy illustrates the loathsomeness of sin, consumption the deceitfulness of sin, palsy shows the helplessness of the sinner when in the power of sin.
1. Blindness. Sin has blinded the eyes of man's understanding so that he cannot see the danger he is in (2Cr 4:4), nor the beauty there is in Christ (Isa 53:2).
2. Deafness. Sin has deafened man's hearing, so that he cannot hear God calling him (Mar 8:18).
3. Defilement. Sin has defiled man's mind and polluted his imagination, so that he cannot appreciate Divine things (Gen 6:5).
4. Corrupting. Sin has corrupted man's heart, so that he has no love for God, and no desire for the things of God (Gen 6:12).
5. Paralysis. Sin has paralysed man's will, so that he has no power to raise himself from the helpless position he is in, and no moral force to enable him to walk in the ways of God (Rom 5:6).
6. Separation. Sin has separated man's soul from God (Isa 59:2), so that he is "dead in sins" (Eph 2:1).
7. Rebellion. Sin has filled man's mind with rebellion, so that he is said to be "carnal" and "enmity against God" (Rom 8:7).