529. How does one reach purity of heart?

529. How does one reach purity of heart?   

(Comp 529) In the battle against disordered desires the baptised person is able, by the grace of God, to achieve purity of heart through the virtue and gift of chastity, through purity of intention, purity of vision (both exterior and interior), discipline of the imagination and of feelings and by prayer.

“In brief”

(CCC 2532) Purification of the heart demands prayer, the practice of chastity, purity of intention and of vision.   

To deepen and explain

(CCC 2520) Baptism confers on its recipient the grace of purification from all sins. But the baptized must continue to struggle against concupiscence of the flesh and disordered desires. With God's grace he will prevail - by the virtue and gift of chastity, for chastity lets us love with upright and undivided heart; - by purity of intention which consists in seeking the true end of man: with simplicity of vision, the baptized person seeks to find and to fulfill God's will in everything (Cf. Rom 12:2; Col 1:10); - by purity of vision, external and internal; by discipline of feelings and imagination; by refusing all complicity in impure thoughts that incline us to turn aside from the path of God's commandments: "Appearance arouses yearning in fools" (Wis 15:5); - by prayer: I thought that continence arose from one's own powers, which I did not recognize in myself. I was foolish enough not to know…  that no one can be continent unless you grant it. For you would surely have granted it if my inner groaning had reached your ears and I with firm faith had cast my cares on you (St. Augustine, Conf. 6, 11, 20: PL 32, 729-730).    

Reflection

(CCC 2849) Such a battle and such a victory become possible only through prayer. It is by his prayer that Jesus vanquishes the tempter, both at the outset of his public mission and in the ultimate struggle of his agony (Cf. Mt 4:1-11; 26:36-44). In this petition to our heavenly Father, Christ unites us to his battle and his agony. He urges us to vigilance of the heart in communion with his own. Vigilance is "custody of the heart," and Jesus prayed for us to the Father: "Keep them in your name" (Jn 17:11; Cf. Mk 13:9, 23, 33-37; 14:38; Lk 12:35-40). The Holy Spirit constantly seeks to awaken us to keep watch (Cf. 1 Cor 16:13; Col 4:2; 1 Thess 5:6; 1 Pet 5:8). Finally, this petition takes on all its dramatic meaning in relation to the last temptation of our earthly battle; it asks for final perseverance. "Lo, I am coming like a thief! Blessed is he who is awake" (Rev 16:15).  

(Next question: What are the other requirements for purity?)