The bible teaches from Genesis to Revelation that sickness and disease is not a blessing. The word of God plainly reveals that Jesus came to undo the work that the devil had done. While Jesus walked the earth he was and is the very expressed image of God. Jesus himself said that He only said what He heard the Father say and did only what He saw the Father do. He even made it plainer when He stated that “when you see me you’ve seen the Father” Jn 14:9.
In the book of Acts it is clear that sickness is revealed to be from satan not from God and it is oppression.
Acts 10:38 (KJV) How God anointed Jesus of Nazareth with the Holy Ghost and with power: who went about doing good, and healing all that were oppressed of the devil; for God was with him.