Blessed are the pure in heart: for they shall see God.
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Theophylact of Ochrid
AD 1107
There are many who are not rapacious and greedy, but are generous in almsgiving, yet they fornicate and commit other uncleanliness. Christ commands, therefore, that along with the other virtues we should also be pure, that is, chaste and temperate, not only in the body, but in the heart as well. Without holiness, namely, chastity, no one will see the Lord. Just as a mirror will reflect images only if it is clean, so also only a pure soul admits the vision of God and the understanding of the Scriptures.
