Chapter 33 — Part IV: Prayer — On Prayer in General
Section 52. Many examples prove that prayers for such as these are very efficacious when offered from the heart. Instances occur every day in which God rescues individuals of every condition of life from the powers of darkness, and transfers them into the kingdom of His Beloved Son, from vessels of wrath making them vessels of mercy. That the prayers of the pious have very great influence in bringing about this result no one can reasonably doubt.