Tertullian On Fasting for why should what is salutary be sad? He taught likewise that fasts are to be the weapons for battling with the more direful demons:[64] The First Epistle of Clement Concerning Virginity and they bring no help to those over whom they make their adjurations; but they speak with terrible words, and affright people, but do not act with true faith, according to the teaching of our Lord, who hath said: "This kind goeth not out but by fasting and prayer,"[122]