This is Volume three (3) of Philip Schaff's History of the Christian Church excels at providing an impressive and instructive historical treatment of the Christian Church.
It is hard to know how to characterize Bernard of Clairvaux. On the one hand, he is called the “honey-tongued doctor” for his eloquent writings on the love of God. On the other hand, he rallied soldiers to kill Muslims during the Crusades. He wrote eloquently on humility; then again, he loved being close to the seat of power and was an adviser to five popes.