In Christian theology, the principle of God's action and humans' response. In the OT the loving character of God was recognized, notably by Hosea, but it is only in the NT that the doctrine that love constitutes the essential nature of God was developed. Christ joined together the different OT commandments that people should love God and their neighbours, but extended it to cover love of enemies. This Christian love (called in the NT ἀγάπη; see agape) is a matter of will rather than the emotions; its manifestations are described in 1 Cor. 13: 1–8.