John Wesley on James 5:14

Having anointed him with oil - This single conspicuous gift, which Christ committed to his apostles, Mark 6:13, remained in the church long after the other miraculous gifts were withdrawn. Indeed, it seems to have been designed to remain always; and St. James directs the elders, who were the most, if not the only, gifted men, to administer at. This was the whole process of physic in the Christian church, till it was lost through unbelief. That novel invention among the Romanists, extreme unction, practised not for cure, but where life is despaired of, bears no manner of resemblance to this.