“Brothers and sisters: The body is not for immorality, but for the Lord, and the Lord is for the body; God raised the Lord and will also raise us by His power. Do you not know that your bodies are members of Christ? But whoever is joined to the Lord becomes one Spirit with Him. Avoid immorality. Every other sin a person commits is outside the body, but the immoral person commits sin against his own body.” St. Paul the Apostle (1st century)

‘Since we consist of soul and body, both are involved in staying on the path. As either may cause us to stumble, we must attend to both: Bodily purity, the protective abstinence from all shameful things and wicked acts. And purity of the soul, keeping true faith in God, neither adding to nor subtracting from it. Godliness is dimmed when the body is soiled and loses its integrity when falsehood enters the soul. But our godliness maintains its beauty and integrity when the spirit sticks to the truth and the body keeps pure. What good is knowing the truth in words while polluting the body with evil deeds? What real good can purity produce if truth is not in the soul? These two rejoice with each other and unite as comrades-in-arms in the fight to bring us into God’s presence.” St. Irenaeus (2nd century)

“Chastity will be lost where the distinction between the sexes is not observed.” St. Ambrose of Milan (4th century, Doctor of the Church)

“If we have gone away, if by living riotously we have squandered the whole substance of our Father, if we have committed any crime or transgression anywhere, if we have come to the whole rocky coast of impurity, and to complete ruin, let us now at last get up…Let us return to such a Father.” St. Peter Chrysologus (5th century, Doctor of the Church)

“We should not wish to see or do anything which could not be done in the presence of God and His creatures, and we shall thus imagine that we are always in His presence.” St. Ignatius of Loyola (15th-16th centuries)

“Be exceedingly quick in turning yourself from every form and allurement of lewdness. This evil works insensibly, and from small beginnings it advances to great troubles. These are always more easy to avoid than to cure.” St. Francis de Sales (16th-17th centuries, Doctor of the Church)

“Indeed, my children, what could be more out of keeping with the holiness of our religion than impure language? It outrages God, it scandalizes our neighbor.” St. John Vianney (18th-19th centuries)

“Erotic love is, therefore, a bridge which one crosses, not a buttress where one sits and rests; it is not an airport but an airplane; it is always going somewhere else, upward and onward. All carnal love presupposes incompleteness, deficiency, yearning for completion, and an attraction for enrichment, for all love is a flight for immortality….The Savior did not crush and then extinguish the flames that burned in[St. Mary] Magdalen’s heart, but transfigured them to a new object of affection. The Divine commendation that was given to the woman who poured out the ointment on the feet of her Savior reminded her that love which once sought its own pleasure can be transmuted into a love that will die for the beloved.” Ven. Fulton Sheen (19th-20th centuries)

 
“Revolting books against virtue are termed courageous; those against morality are advertised as daring and forward-looking; and those against God are called progressive and epoch-making. It has always been the characteristic of a generation in decay to paint the gates of hell with the gold of paradise.” Ven. Fulton Sheen

 
“There is no surer formula for discontent than to try to satisfy our cravings for the ocean of Infinite Love from the teacup of finite satisfactions. Nothing material, physical, or carnal can ever satisfy man completely; he has an immortal soul which needs an Eternal Love. ‘Not by bread alone doth man live’.” Ven. Fulton Sheen

“When a woman’s love becomes venal, everything is lost. When it is kept noble, it brings to the world the balm of tenderness and devotion. The level of any civilization is thus the level of its womanhood.” Ven. Fulton Sheen

“The preservation of innocence is not due to prudery, to fear, to love of isolation, but to a passionate desire to preserve a secret until God gives the one to whom it can be whispered.” Ven. Fulton Sheen

“There is no room in the world for selfishness. It destroys the meaning of life; it destroys the meaning of love; it reduces the human person to a subhuman level.” Pope St. John Paul II (20th-21st centuries)

“Never forget that blindly following the impulse of our emotions often mean becoming a slave to our passions.” Pope St. John Paul II