The Epistles of Cyprian

²³ But some one says, “What, then, shall become of those who in past times, coming from heresy to the Church, were received without baptism?”The Lord is able by His mercy to give indulgence, and not to separate from the gifts of His Church those who by simplicity were admitted into the Church, and in the Church have fallen asleep. Nevertheless it does not follow that, because there was error at one time, there must always be error; since it is more fitting for wise and God-fearing men, gladly and without delay to obey the truth when laid open and perceived, than pertinaciously and obstinately to struggle against brethren and fellow priests on behalf of heretics.