Although among heretics and schismatics there is the same Baptism, nevertheless, the remission of sins is not operative among them because of the very rottenness of discord and wickedness of dissension ... Baptism was in them, but it did not profit them outside the Church ... Outside the Church, Baptism works death because of discord.
Saint AugustineThere is a joy which is not given to the ungodly, but to those who love Thee for Thine own sake, whose joy Thou Thyself art. And this is the happy life, to rejoice to Thee, of Thee, for Thee; this it is, and there is no other.
Saint AugustineIf they find a Christian mistaken in a field which they themselves know well and hear him maintaining his foolish opinions about our books, how are they going to believe those books in matters concerning the resurrection of the dead, the hope of eternal life, and the kingdom of heaven.
Saint Augustine