Tertullian

Learn then now, that His is a spiritual armour and warfare, since you have already discovered that the captivity is spiritual, in order that you may further learn that this also belongs to Him, even because the apostle derived the mention of the captivity from the same prophets as suggested to him his precepts likewise: "Putting away lying," (says he, ) "speak every man truth with his neighbour; " and again, using the very words in which the Psalm expresses his meaning, (he says, ) "Be ye angry, and sin not; " "Let not the sun go down upon your wrath.