In this title, the great philosophical teacher explains why reason shows there must be a God. "How to Prove There Is a God" contains articles from different stages of Adler's philosophical career, with pieces from 1943 to 1981 showing him defending his position against critics and struggling to improve it by correcting his earlier errors. Nearly all the chapters have never appeared in book form before and have been hard to find, and some have not previously been printed anywhere. Adler, who died in 2001, attracted a large following and a large readership because of his best-selling books, such as "How to Read a Book", his TV lectures on philosophy, and his promotion of "The Great Ideas" and "The Great Books of the Western World". Although always a thinker in the Catholic Thomist tradition, he only became a Catholic shortly before his death, and for most of his life he described himself as a pagan.