"Once sex and marriage has been redefined and trivialized in this way, it is possible to change the definition and makeup of marriage or anything related to sexuality," he continued.
However, Aquila believes that Humanae Vitae and the theology of the body reveal the antidote to "the widespread false ideas of freedom and the purpose of sexuality that so many are suffering from today."
"Blessed Paul VI teaches us the truth about married love, listing its four essential qualities: it needs to be fully human, total, faithful and fruitful," Aquila said, also noting their inseparable connections.
Despite the cultural distortion of sexuality and marriage over the years, Aquila noted that the goodness of sexuality remains through the dignity of each human person.
"We also know from Scripture…that our dignity comes from being made in his image and likeness," Aquila said.
"God, the source of all life and love, planned from the beginning that the love between a man and a woman should image his own love and bring forth new life in the context of family," he continued.
Humanae Vitae teaches procreative love is an "extremely important mission" with both "supernatural and eternal" effects, the archbishop said. Aquila calls this the "very nature of married love," which also prompts a husband and wife together towards holiness.
"Through the sincere gift of themselves, spouses discover their authentic identities as children of God the Father, and their love radiates beauty and the splendor of the truth," Aquila said.
While Humanae Vitae proclaims the bold beauty behind the Church's teachings on sexuality, it also reminds the faithful of the Church's mission of evangelization, Aquila noted.
"Every Catholic has a mission to live and share the good news of God's plan for human sexuality," Aquila said, saying this proclamation requires courage.
"We evangelize first by witnessing to what God has done in our own lives and by living out Christ's teaching in our family and work," he continued, saying that "pointing people to the teaching of Jesus is not confrontational, but an act of love."
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The first evangelizers of society, Aquila said, are parents and married couples, who are the primary educators of children. Because of this, parents and couples have the responsibility to faithfully teach their children in the truths of the Church.
Unfortunately, today's children are bombarded with distorted sexual ethics at a young age, with exposure to pornography and the lure of casual sex, the archbishop said. These dangers present new challenges to parents in their efforts to raise children of God, but Aquila encouraged honest conversations with children to promote healthy relationships.
He also pointed out that priests and deacons are called to evangelize to their own flocks. Aquila advised priests to be "gentle and merciful in confession," and re-commit themselves to their work with engaged and married couples.
Aquila also addressed individuals in the workforce, encouraging them to give witness to the truth in their everyday lives. He also specifically addressed engaged couples, asking them to "make the most of your preparation for marriage."
Aquila concluded his pastoral letter by mentioning the endless measure of God's love, and encouraged individuals and couples everywhere to reflect this true love through "a complete gift" of themselves.
He challenged married couples to be generous in their love and to imitate Christ's ultimate sacrificial love as the way "to find true happiness." Aquila also pointed back to Humanae Vitae, saying its 50th anniversary is the perfect occasion for a renewed commitment to sharing the liberating truth that it proclaims about sexuality.