The Glasites or Sandemanians were a branch of the church with their roots in Scotland, but who spread much wider. This study seeks to explore their distinctives, both of theology and practice, and to place them in a wider context. The examination of a small sect serves to illuminate the wider story, and this particular community nurtured within it several eminent thinkers whose influence has been of deep importance—not the least, the scientific pioneer Michael Faraday. In exploring both their growth and their decline, the author seeks to convey something of the flavor of this part of the church and to consider what their legacy is.