8 Now, if such are the temptations of men who, since their bodies are emaciated with fasting, have only evil thoughts to fear, how must it fare with a girl whose surroundings are those of luxury and ease? Surely, to use the apostle's words, “She is dead while she lives.” Therefore, if experience gives me a right to advise, or clothes my words with credit, I would begin by urging you and warning you as Christ's spouse to avoid wine as you would avoid poison. For wine is the first weapon used by demons against the young.
Greed does not shake, nor pride puff up, nor ambition infatuate so much as this. Other vices we easily escape, but this enemy is shut up within us, and wherever we go we carry him with us. Wine and youth between them kindle the fire of sensual pleasure. Why do we throw oil on the flame— why do we add fresh fuel to a miserable body which is already ablaze. Paul, it is true, says to Timothy “drink no longer water, but use a little wine for your stomach's sake, and for your frequent infirmities.” But notice the reasons for which the permission is given, to cure an aching stomach and a frequent infirmity.
And lest we should indulge ourselves too much on the score of our ailments, he commands that but little shall be taken; advising rather as a physician than as an apostle (though, indeed, an apostle is a spiritual physician). He evidently feared that Timothy might succumb to weakness, and might prove unequal to the constant moving to and fro involved in preaching the Gospel. Besides, he remembered that he had spoken of “wine wherein is excess,” and had said, “it is good neither to eat flesh nor to drink wine.” Noah drank wine and became intoxicated; but living as he did in the rude age after the flood, when the vine was first planted, perhaps he did not know its power of inebriation.
And to let you see the hidden meaning of Scripture in all its fullness (for the word of God is a pearl and may be pierced on every side) after his drunkenness came the uncovering of his body; self-indulgence culminated in lust. First the belly is crammed; then the other members are roused. Similarly, at a later period, “The people sat down to eat and to drink and rose up to play.” Lot also, God's friend, whom He saved upon the mountain, who was the only one found righteous out of so many thousands, was intoxicated by his daughters.
And, although they may have acted as they did more from a desire of offspring than from love of sinful pleasure— for the human race seemed in danger of extinction— yet they were well aware that the righteous man would not abet their design unless intoxicated. In fact he did not know what he was doing, and his sin was not wilful. Still his error was a grave one, for it made him the father of Moab and Ammon, Israel's enemies, of whom it is said: “Even to the fourteenth generation they shall not enter into the congregation of the Lord forever.”
Source: Letters (New Advent)