2 Corinthians 3:18:

But we all, with open face beholding as in a glass the glory of the Lord, are changed into the same image from glory to glory, even as by the Spirit of the Lord.

See also:

Who You Are and What You Have
Objection: Saying, “I Am Healed” When You Are Actually Sick Is Lying, and Therefore Sin
Objection: “Faith Healers” Call Attention to Man and Thus Rob the Lord of Due Glory