Why was the Inquisition established at all?

On the same principle as that by which the U. S. Government passed the “Pure Foods Act” to prevent contamination of the foods we eat. The Inquisition was established and still exists in the Church to prevent the doctrine of Christ, which gives life to our souls, from being adulterated and contaminated. The Spanish Inquisition, of course, as a semi-political institution has lapsed,

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty