Chapter 39.
75 Eugenius of Ammedera said: "I too pronounce this same judgment, that heretics should be baptized."
76. To him we answer: But this is not the judgment which the Church pronounces, to which also God has now revealed in a plenary Council the point in which you were then still otherwise minded, but because saving charity was in you, you remained in unity.
Source: On Baptism, Against the Donatists (New Advent)