At the South Florida CFO in 1973, Hal Hill tells campers that unbelief works like a “bias voltage,” blocking the flow of God’s power the way a negative charge blocks a circuit. He illustrates it with a “glory meter” that a scientist friend built to measure the Holy Spirit’s presence in a person. He also points to the Apollo 13 astronauts’ shorter recorded flight time as proof, in his view, that nearing the speed of light can run history backward.
