“Either we must speak as we dress, or dress as we speak. Why do we profess one thing and display another? The tongue talks of chastity, but the whole body reveals impurity.” St. Jerome (4th-5th centuries, Doctor of the Church)

“He that is chaste before marriage, much more will be chaste after it; and he that practiced fornication before, will practice it after marriage…Garland are wont to be worn on the heads of bridegrooms, as a symbol of victory, betokening that they approach the marriage bed unconquered by pleasure. But if captivated by pleasure he has given himself up to harlots, why does he wear the garland, since he has been subdued?” St. John Chrysostom (4th-5th centuries, Doctor of the Church)

“It is not good to look at what it is not lawful to desire.” Pope St. Gregory the Great (5th-6th centuries, Doctor of the Church)

“It must be known that this Commandment [Thou shalt not commit adultery] does not merely forbid adultery, but also every form of immodesty and impurity.” St. Thomas Aquinas (13th century, Doctor of the Church)

“Sensual pleasures weaken and diminish the strength of the mind, relax the heart and chill the love we owe to God.” St. Francis de Sales (16th-17th centuries, Doctor of the Church)

“A provident God grants sufficient means to the human race to find a dignified solution to the problems attendant upon the transmission of human life. But these problems can become difficult of solution, or even insoluble, if man, led astray in mind and perverted in will, turns to such means as are opposed to right reason, and seeks ends that are contrary to his social nature and the intentions of Providence.” Pope St. John XXIII (19th-20th centuries)

“Minds no longer object to the Church, because of the way they think, but because of the way they live. They no longer have difficulty with the Creed, but with her Commandments; they remain outside her saving waters, not because they cannot accept the doctrine of Three Persons in One God, but because they cannot accept the moral of two persons in one flesh; not because Infallibility is too complex, but because the veto on Birth Control is too hard; not because the Eucharist is too sublime, but because Penance is too exacting. Briefly, the heresy of our day is not the heresy of thought; it is the heresy of action.” Ven. Fulton Sheen (19th-20th centuries)

“Divorce, infidelity, planned un-parenthood, invalid marriages are so many travesties and heresies against love – and whatever is the enemy of love is the enemy of life and happiness.” Ven. Fulton Sheen

“An era of sensuality is necessarily an era of persecution. An age of unreason is an age of mockery. Wicked power will not submit to the judgment of truth.” Ven. Fulton Sheen

“Sexuality, by means of which man and woman give themselves to one another through acts which are proper and exclusive to spouses, is by no means something purely biological, but concerns the innermost being of the human person as such. It is realized in a truly human way only if it is an integral part of the love by which man and a woman commit themselves totally to one another until death.” Pope St. John Paul II (20th-21st centuries)

“At times, in the discussions about new and complex moral problems, it can seem that Christian morality is in itself too demanding, difficult to understand and almost impossible to practice. This is untrue, since Christian morality consists, in the simplicity of the Gospel, in following Jesus Christ, in abandoning oneself to Him, in letting oneself be transformed by His grace and renewed by His mercy, gifts which come to us in the living communion of His Church.” Pope St. John Paul II

“The attractions offered by the agents of the demon of impurity are very alluring and the defending barrier of the flesh pleads strongly. Do not enter into dialogue with them. After a short moment of pleasure, you will have nothing but boredom, loneliness, and remorse. Why exchange heaven for hell?” Ven. Francis Xavier Nguyen Van Thuan (20th-21st centuries)