Originally published in 1934. "Know yourself." How can we sanctify ourselves, if we do not know ourselves? Self-knowledge is an essential key to mastering the Science of the Saints. Philosophers outline four basic temperaments. Fr. Hock masterfully discusses the four temperaments and the spiritual challenges of each and how to apply the appropriate remedies. This book is written for the average layman and at the end has a test so you can determine what your temperament is and then study the work again to become a saint.