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 impartiality the claims of so remarkable an institution as the Catholic Church evidently is. They should accompany their inquiries with humble prayer, that God may enlighten their minds and strengthen their wills. For it requires grace to know and follow the guide divinely appointed to lead men to Heaven; and grace is to be obtained by prayer.

5. The systematic study of the Catholic religion is usually divided into three parts. The first examines the reasons why all men should accept the claim to infallible teaching on the part of the Catholic Church; the second considers all her doctrines in detail; the third explains the duties imposed upon her members. We shall treat these parts respectively under the titles of, ''1. The teaching authority, 2. The doctrines of the Catholic Church, 3. The duties of Catholics.