In Christian theology, the world, the flesh, and the devil (Latin: mundus, caro, et diabolus; Greek: ό κοσμος, ή σαρξ, και ό διαβολος) have been singled out "by sources from St Thomas Aquinas" to the Council of Trent, as "implacable enemies of the soul". The three sources of temptation have been described as: world -- "indifference and opposition to God’s design", "empty, passing values"; flesh -- "gluttony and sexual immorality, ... our corrupt inclinations, disordered passions"; the Devil -- "a real, personal enemy, a fallen angel, Father of Lies, who ... labours in relentless malice to twist us away from salvation". Those sources are seen as in opposition to the three persons of God, i.e. the Trinity. Sources Scripture Scripture that refers to the three sources of temptation is thought to include: Jesus' parable of the Sower (Mathew 13): the first two scenes of unproductive soil represent the devil and the flesh (not so much the world) birds eating the seed -- (Matthew 13:19) "When anyone hears the message about the kingdom and does not understand it, the evil one comes and snatches away what was sown in their heart"; The seed falling among the thorns -- (Matthew 13:22) "refers to someone who hears the word, but the worries of this life and the deceitfulness of wealth choke the word, making it unfruitful." They are reflected in the Temptation of Christ in the desert: the world: to tempt God by casting himself off the pinnacle; the flesh: to turn stones into bread; and the devil: to worship Satan. Ephesians 2:2–3a. You once walked, following the course of this world, following the prince of the power of the air, the spirit that is now at work in the sons of disobedience — among whom we all once lived in the passions of our flesh; in addition to "this world" and "passions of our flesh", "the term air often referred to the spiritual realm of angels and demons". Christian literature Many Christian sources refer to the world, the flesh, and the devil. Peter Abelard states in his Expositiones that: Tria autem sunt quae nos tentant, caro, mundus, diabolus ("There are three things which tempt us, the flesh, the world, and the devil"). In his third objection to "prudence of the flesh" being a sin in Summa Theologica, Thomas Aquinas states: "just as man is tempted by the flesh, so too is he