10. If then we desire to see God, whereby shall our eye be purified? For who would not care for, and diligently seek the means of purifying that eye whereby he may see Him whom he longeth after with an entire affection? The Divine record has expressly mentioned this when it says, “purifying their hearts by faith.” The faith of God then purifies the heart, the pure heart sees God. But because this faith is sometimes so defined by men who deceive themselves, as though it were enough only to believe (for some promise themselves even the sight of God and the kingdom of heaven, who believe and live evilly); against these, the Apostle James, incensed and indignant as it were with a holy charity, saith in his Epistle, “Thou believest there is one God.” Thou applaudest thyself for thy faith, for thou markest how that many ungodly men think there are gods many, and thou rejoicest in thyself because thou dost believe that there is but one God; “Thou doest well: the devils also believe, and tremble.” Shall they also see God? They shall see Him who are pure in heart. But who can say that unclean spirits are pure in heart? And yet they also “believe and tremble.”