From Pope St. John Paul II’s Apostolic Exhortation Familiaris Consortio (1981):
In the field of conjugal morality the Church is Teacher and Mother and acts as such.
As Teacher, she never tires of proclaiming the moral norm that must guide the responsible transmission of life. The Church is in no way the author or the arbiter of this norm. In obedience to the truth which is Christ, whose image is reflected in the nature and dignity of the human person, the Church interprets the moral norm and proposes it to all people of good will, without concealing its demands of radicalness and perfection.
As Mother, the Church is close to the many married couples who find themselves in difficulty over this important point of the moral life: she knows well their situation, which is often very arduous and at times truly tormented by difficulties of every kind, not only individual difficulties but social ones as well; she knows that many couples encounter difficulties not only in the concrete fulfillment of the moral norm but even in understanding its inherent values.
But it is one and the same Church that is both Teacher and Mother. And so the Church never ceases to exhort and encourage all to resolve whatever conjugal difficulties may arise without ever falsifying or compromising the truth: she is convinced that there can be no true contradiction between the divine law on transmitting life and that on fostering authentic married love.91 Accordingly, the concrete pedagogy of the Church must always remain linked with her doctrine and never be separated from it. With the same conviction as my predecessor, I therefore repeat: “To diminish in no way the saving teaching of Christ constitutes an eminent form of charity for souls.”92
On the other hand, authentic ecclesial pedagogy displays its realism and wisdom only by making a tenacious and courageous effort to create and uphold all the human conditions—psychological, moral and spiritual—indispensable for understanding and living the moral value and norm.
There is no doubt that these conditions must include persistence and patience, humility and strength of mind, filial trust in God and in His grace, and frequent recourse to prayer and to the sacraments of the Eucharist and of Reconciliation.93 Thus strengthened, Christian husbands and wives will be able to keep alive their awareness of the unique influence that the grace of the sacrament of marriage has on every aspect of married life, including therefore their sexuality: the gift of the Spirit, accepted and responded to by husband and wife, helps them to live their human sexuality in accordance with God’s plan and as a sign of the unitive and fruitful love of Christ for His Church.
But the necessary conditions alone in the knowledge of the bodily aspect and the body’s rhythms of fertility. Accordingly, every effort must be made to render such knowledge accessible to all married people and also to young adults before marriage, through clear, timely and serious instruction and education given by married couples, doctors and experts. Knowledge must then lead to education in self-control: hence the absolute necessity for the virtue of chastity and for permanent education in it. In the Christian view, chastity by no means signifies rejection of human sexuality or lack of esteem for it: rather it signifies spiritual energy capable of defending love from the perils of selfishness and aggressiveness, and able to advance it towards its full realization.
With deeply wise and loving intuition, Paul VI was only voicing the experience of many married couples when he wrote in his Encyclical: “To dominate instinct by means of one’s reason and free will undoubtedly requires ascetical practices, so that the affective manifestations of conjugal life may observe the correct order, in particular with regard to the observance of periodic continence. Yet this discipline which is proper to the purity of married couples, far from harming conjugal love, rather confers on it a higher human value. It demands continual effort, yet, thanks to its beneficent influence, husband and wife fully develop their personalities, being enriched with spiritual values. Such discipline bestows upon family life fruits of serenity and peace, and facilitates the solution of other problems; it favors attention for one’s partner, helps both parties to drive out selfishness, the enemy of true love, and deepens their sense of responsibility. By its means, parents acquire the capacity of having a deeper and more efficacious influence in the education of their offspring.”94
91 Pastoral Constitution on the Church in the Modern World Gaudium et spes, 51.
92 Encyclical Humanæ Vitæ, 29: Acta Apostolicæ Sedis 60 (1968), 501.
93 Cf. Ibid., 25: l.c., 498-499.
94 Ibid., 21: l.c., 496.
— Familiaris Consortio 33