1 Corinthians 12:31:

But covet earnestly the best gifts: and yet I shew unto you a more excellent way.

See also:

All About Healing Services
Can I “Turn On” Gifts of the Spirit at Will?
Can We Pray and Believe for the Healing Anointing to Manifest?
How Can We See More Miracles Today?
Should I Ask God to Use Me or to Make Me Usable?