Mike Reeves stands in for John Piper on Episode 381 of 'Ask Pastor John' from Desiring God, discussing the practice of praying to the mother of Jesus.
Cyril's Second Letter to Nestorius is an attempt to correct false teaching. Cyril argues for the unity of the person of Christ, examining Christ's pre-existence, birth, suffering, and death.
Cyril's third letter his colleague, Nestorius, is a more lengthly and robust argument against his false teaching. It includes twelve 'anathemas' (curses) which Cyril hoped Nestorius would accept.