The kingdom of heaven can be felt, but not seen. The inward working of the Spirit of God is compared to leaven.... Christ by this parable illustrates the human heart. The leaven of truth, working inwardly will be revealed in the life. The heart must be cleansed from all impurity, man must be fitted with traits of character that will enable him to do service for God in any line. The process is invisible by which the leaven changes the mass of meal into which it has been introduced, but it works until the meal is converted into bread. So must the Spirit of God work a radical change. New faculties are not supplied, but a thorough change is made in the employment of those faculties. The natural inclinations are softened and subdued. New thoughts, new feelings, new motives are implanted. But while every faculty is regenerated, man does not lose his identity.... (TDG 186.2) MC VC