 John Epps's faith stayed with him throughout his life; it is recorded that "with his last breath he expressed his humble, yet confident faith in the power, wisdom, and goodness of the Great Father of all spirits".Epps wrote a number of books, starting before he attended university with "A New Way of Teaching English Grammar".In London he published "An Introduction to Botany", intended as a textbook for his students, and two books on phrenology called "Evidences of Christianity Deduced from Phrenology" (1827, as "Medicus") and "Horae Phrenologicae".