I said, “Have mercy on me, LORD; heal me, for I have sinned against you.”
(Psalm 41:4 NIV)
Did you know that some sicknesses are as a result of sin? After healing the man who had been crippled for thirty-eight years, Jesus warned him, “See, you are well again. Stop sinning or something worse may happen to you” (John 5:14). And when He saw the paralytic, the first thing that Jesus said to him was, “Son, your sins are forgiven” (Mark 2:5). That’s why during his time of sickness David prayed, “Have mercy on me, LORD; heal me, for I have sinned against you.” If we confess our sins, God won’t only forgive us our sins, but heal us of our diseases as well.
Sin causes sickness, but forgiveness brings healing.
Rising with the Son 
If our diseases are a result of sin, how do we explain :
“Jesus answered, “Neither this man nor his parents sinned; he was born blind so that God’s works might be revealed in him.(John 9:3)
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“Sin causes sickness” might be a Jewish belief in the OT times
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Thank you for your comment. Please note that I’m not implying that all sickness is a result of sin. I’m drawing on the experience of the Psalmist and others who were sick as a result of hidden sin they were aware of. That’s something only God and the individual would know. As in the miracle of the man born blind, God can use our sickness to bring glory to Himself. Blessings to you.
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