7 But none of these things thoroughly awakens them, so great was their dullness, and with this their envy also: both which we must with exact care root out of our mind; and he must be more fervent than fire who is to stand in such an array. Wherefore also Christ said, “I have come to send fire on earth, and I would it were already kindled.” in the same lot with it, even so godly tears are a germ of perpetual and unfading joy. In this way the very harlot became more honorable than virgins when seized by this fire. That is, being thoroughly warmed by repentance, she was thenceforth carried out of herself by her longing desire toward Christ; loosing her hair, and drenching with her tears His holy feet, and wiping them with her own tresses, and exhausting the ointment. And all these were outward results, but those wrought in her mind were far more fervent than these; which things God Himself alone beheld. And therefore, every one, when he hears, rejoices with her and takes delight in her good works, and acquits her of every blame. But if we that are evil pass this judgment, consider what sentence she obtained from that God who is a lover of mankind; and how much, even before God's gifts, her repentance caused her to reap in the way of blessing.
For much as after a violent burst of rain, there is a clear open sky; so likewise when tears are pouring down, a calm arises, and serenity, and the darkness that ensues on our sins quite disappears. And like as by water and the spirit, so by tears and confession are we cleansed the second time; unless we be acting thus for display and vanity: for as to a woman whose tears were of that sort, I should call her justly condemnable, more than if she decked herself out with lines and coloring. For I seek those tears which are shed not for display, but in compunction; those which trickle down secretly and in closets, and in sight of no man, softly and noiselessly; those which arise from a certain depth of mind, those shed in anguish and in sorrow, those which are for God alone; such as were Hannah's, for “her lips moved,” it is said, “but her voice was not heard;” however, her tears alone uttered a cry more clear than any trumpet. And because of this, God also opened her womb, and made the hard rock a fruitful field.
If you also weep thus, you have become a follower of your Lord. Yea, for He also wept, both over Lazarus, and over the city; and touching Judas He was greatly troubled. And this indeed one may often see Him do, but nowhere laugh, nay, nor smile but a little; no one at least of the evangelists has mentioned this. Therefore also with regard to Paul, that he wept, that he did so three years night and day, both he has said of himself, and others say this of him; but that he laughed, neither has he said himself anywhere, neither has so much as one other of the saints, either concerning him, or any other like him; but this is said of Sarah only, when she is blamed, and of the son of Noe, when for a freeman he became a slave.
Source: Homilies on the Gospel of St. Matthew (New Advent)