Against indiscreet zeal.

"You wicked servant! I forgave you your entire debt because you begged me to. Should you not have had pity on your fellow servant, as I had pity on you?" - Sunday's Gospel, Matthew 18:21-35
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Do not think that, because the virtues you have in mind do not shine in your neighbor, he will not be precious in God's sight for something of which you are not thinking. - Sayings of Light and Love, St. John of the Cross
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Among spiritual persons there are also those who fall into ...  spiritual anger.  Through a certain indiscreet zeal they become angry over the sins of others, they reprove these others, and sometimes even feel the impulse to do so angrily, which in fact they occasionally do, setting themselves up as lords of virtue.  All such conduct is contrary to spiritual meekness. - Dark Night, Chapter 5:2
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Art:  Illumination - Christ healing the leper.  It is perhaps beneficial for us to keep in mind that Our Lord was not put off by the leper's vile raiment and condition.

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How Francis embraced the leper.

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"The Lord gave me, Brother Francis, thus to begin doing penance in this way: for when I was in sin, it seemed too bitter for me to see lepers. And the Lord Himself led me among them and I showed mercy to them. And when I left them, what had seemed bitter to me was turned into sweetness of soul and body."