This Beatitude speaks of those whose hearts are simple, pure and undefiled, for a heart capable of love admits nothing that might harm, weaken or endanger that love. The Bible uses the heart to describe our real intentions, the things we truly seek and desire, apart from all appearances. “Man sees the appearance, but the Lord looks into the heart” (1Sam 16:7). God wants to speak to our hearts (cf. Hos 2:16); there he desires to write his law (cf. Jer 31:33). In a word, he wants to give us a new heart (cf. Ezek36:26).
“Guard your heart with all vigilance” (Prov 4:23). Nothing stained by falsehood has any real worth in the Lord’s eyes. He “flees from deceit, and rises and departs from foolish thoughts” (Wis 1:5). The Father, “who sees in secret” (Mt 6:6), recognizes what is impure and insincere, mere display or appearance, as does the Son, who knows “what is in man” (cf. Jn 2:25).
Certainly there can be no love without works of love, but this Beatitude reminds us that the Lord expects a commitment to our brothers and sisters that comes from the heart. For “if I give away all I have, and if I deliver my body to be burned, but have no love, I gain nothing” (1 Cor 13:3). In Matthew’s Gospel too, we see that what proceeds from the heart is what defiles a person (cf. 15:18), for from the heart come murder, theft, false witness, and other evil deeds (cf. 15:19). From the heart’s intentions come the desires and the deepest decisions that determine our actions.
A heart that loves God and neighbour (cf. Mt 22:36-40), genuinely and not merely in words, is a pure heart; it can see God. In his hymn to charity, Saint Paul says that “now we see in a mirror, dimly” (1 Cor 13:12), but to the extent that truth and love prevail, we will then be able to see “face to face”. Jesus promises that those who are pure in heart “will see God”.
Keeping a heart free of all that tarnishes love: that is holiness.