In John 10:10,11 Jesus said, "The thief [devil]
cometh not, but for to steal, and to kill, and
to destroy. I am [Jesus] come that they might
have life, and that they might have it more
abundantly. I am [Jesus] the good shepherd:
the good shepherd giveth his life for the sheep.

This scripture clearly separates and explains
what is of the devil and what is of Jesus!

Sickness, disease and infirmities can kill,
can steal what is good in life, and destroy the
lives of others. That's certainly not of God.