John 10:37-38:

If I do not the works of my Father, believe me not.
But if I do, though ye believe not me, believe the works: that ye may know, and believe, that the Father is in me, and I in him.

See also:

How to See God’s Will Concerning Healing
Objection: Jesus Only Said That He Was Sent to Heal the Brokenhearted, Not the Sick