Baptism does not profit a man outside unity with the Church ... For many heretics also possess this Sacrament but not the fruits of salvation ... The benefits which flow from Baptism are necessarily fruits which belong to the true Church alone. Children Baptized in other communions cease to be members of the Church when, after reaching the age of reason, they make formal profession of heresy, as, for example, by receiving communion in a non-Catholic Church.
Saint AugustineDon't you believe that there is in man a deep so profound as to be hidden even to him in whom it is?
Saint AugustineAugustineThe wounds of a friend are better than the kisses of an enemy. To love with sternness is better than to deceive with gentleness.... In Luke [14:23] it is written: "Compel people to come in!" By threats of the wrath of God, the Father draws souls to his Son.
Saint Augustine