John 1:3
Let us then not sleep. This is not the season of night, but of day. Let us therefore “walk honestly as in the day”; and nothing is more indecent than sin. In point of indecency it is not so bad to go about naked as in sin and wrong doing. That is not so great matter of blame, since it might even be caused by poverty; but nothing has more shame and less honor than the sinner. Let us think of those who come to the justice-hall on some account of extortion, or overreaching; how base and ridiculous they appear to all by their utter shamelessness, their lies, and audacity. But we are such pitiable and wretched beings, that we cannot bear ourselves to put on a garment awkwardly or awry; nay, if we see another person in this state, we set him right; and yet though we and all our neighbors are walking on our heads, we do not even perceive it.
For what, say, can be more shameful than a man who goes in to a harlot? What more contemptible than an insolent, a foul-tongued or an envious man? Whence then is it that these things do not seem so disgraceful as to walk naked? Merely from habit. To go naked no one has ever willingly endured; but all men are continually venturing on the others without any fear. Yet if one came into an assembly of angels, among whom nothing of the sort has ever taken place, there he would clearly see the great ridicule (of such conduct).
And why do I say an assembly of angels? Even in the very palaces among us, should one introduce a harlot and enjoy her, or be oppressed by excess of wine, or commit any other like indecency, he would suffer extreme punishment. But if it be intolerable that men should dare such things in palaces, much more when the King is everywhere present, and observes what is done, shall we if we dare them undergo severest chastisement. Wherefore let us, I exhort you, show forth in our life much gentleness, much purity, for we have a King who beholds all our actions continually.
In order then that this light may ever richly enlighten us, let us gladly accept these bright beams, for so shall we enjoy both the good things present and those to come, through the grace and lovingkindness of our Lord Jesus Christ, by whom, and with whom, to the Father, and the Holy Spirit, be glory for ever and ever. Amen.
Source: Homilies on the Gospel of John (New Advent)