Not once in the New Testament does it say that it was God's Will for anyone to be anything but healthy, well, healed, and whole. Not once did Jesus tell anyone that He would not heal them "because it was God's Will for them to be sick and unhealthy". Not once did Jesus tell someone to "be sick" so that the person could "learn something". Jesus said that He only did what the Father did.
John 5:19 (KJV)
19 Then answered Jesus and said unto them, Verily, verily, I say unto you, The Son can do nothing of himself, but what he seeth the Father do: for what things soever he doeth, these also doeth the Son likewise.
The New Testament presents to us the true nature of God. The New Testament/ New Covenant presents to us God as He wants to be and as He really is, the true nature of God. The Old Testament presented God not as He wants to be but had to be until Jesus came onto this earth to accomplish God's Will.
Isaiah 53:5 (KJV)
5 But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed.
Jesus took all our sickness, diseases, and ailments onto Himself so that we would not have to bear them. Isaiah is a prophecy for what Jesus would accomplish.
1 Peter 2:24 (KJV)
24 Who his own self bare our sins in his own body on the tree, that we, being dead to sins, should live unto righteousness: by whose stripes ye were healed.
In 1 Peter we see what "was" accomplished, in the past, by Jesus. We have healing waiting for us in the spiritual realm, just like salvation. We get healing in our bodies the same way we get salvation. We believe, and we receive.
Acts 3:6 (KJV)
6 Then Peter said, Silver and gold have I none; but such as I have give I thee: In the name of Jesus Christ of Nazareth rise up and walk.
In Acts we see an example of how to bring healing into our bodies. By words, in the name of Jesus.
Start speaking words of healing into your body and into your life.
In the name of Jesus, I bless you with the life, wisdom, and understanding of God.