George Jeffreys (28 February 1889–26 January 1962) was one of greatest evangelists of the 20th Century, and who had a powerful healing ministry that spread across the United Kingdom. In his book Healing Rays, Jeffreys attempted to share from the Scriptures some hindrances to divine healing.
But Jesus said unto them, A prophet is not without honour, but in his own country, and among his own kin, and in his own house. And he could there do no mighty work, save that he laid his hands upon a few sick folk, and healed them. And he marvelled because of their unbelief. And he went round about the villages, teaching. (Mark 6:4-6)
Seeking healing for self-gratification:
Ye ask, and receive not, because ye ask amiss, that ye may consume it upon your lusts. (James 4:3)
Being guilty of personal sins:
If I regard iniquity in my heart, the Lord will not hear me. (Psalm 66:18)