Tertullian On Prayer who, praying in spirit,[181] Origen de Principiis Book II For this, I think, he indicates when he says, "I will pray with the spirit, I will pray with the understanding also; I will sing with the spirit, I will sing with the understanding also.[131] Origen Commentary on Matthew Book XIV But he that asketh must do everything in his power that he may pray "with the spirit" and pray also "with the understanding,"[205]