Dr. D. Martyn Lloyd Jones, the renowned Welsh minister who pastored the famous Westminster Chapel in London for 30 years, recounted an incident from his early ministry that struck me as I read it. He wrote: (my underlining)
"I remember a woman we who was a spiritist, and even a medium, a paid medium employed by a spiritist society. She used to go every Sunday evening to a spiritist meeting and was paid three guineas for acting as a medium. This was during the thirties, and that was quite a large sum of money for a lower middle-class woman. She was ill one Sunday and could not go to keep her appointment. She was sitting in her house and she saw people passing by on their way to the church where I happened to be ministering in South Wales. Something made her feel a desire to know what those people had, and so she decided to go to the service, and did so. She came ever afterwards until she died, and became a very fine Christian. One day I asked her what she had felt on that first visit, and this is what she said to me; and this is the point I am illustrating. She said, 'The moment I entered your chapel and sat down on a seat amongst the people I was conscious of a power. I was conscious of the same sort of power as I was accustomed to in our spiritist meetings, but there was one big difference; I had a feeling that the power in your chapel was a clean power.' The point I am making is simiply this, that she was aware of a power. This is this myserious element. It is the presence of the Spirit in the heart of God's children.... (From Preachers and Preaching, p. 44)