Universal Call to Holiness (from Lumen gentium, Chapter 5)
39. The Church, whose mystery is being set forth by this Sacred Synod, is believed to be indefectibly holy. Indeed Christ, the Son of God, who with the Father and the Spirit is praised as “uniquely holy,” loved the Church as His bride, delivering Himself up for her. He did this that He might sanctify her. He united her to Himself as His own body and brought it to perfection by the gift of the Holy Spirit for God’s glory. Therefore in the Church, everyone whether belonging to the hierarchy, or being cared for by it, is called to holiness, according to the saying of the Apostle: “For this is the will of God, your sanctification”. However, this holiness of the Church is unceasingly manifested, and must be manifested, in the fruits of grace which the Spirit produces in the faithful; it is expressed in many ways in individuals, who in their walk of life, tend toward the perfection of charity, thus causing the edification of others; in a very special way this (holiness) appears in the practice of the counsels, customarily called “evangelical.” This practice of the counsels, under the impulsion of the Holy Spirit, undertaken by many Christians, either privately or in a Church-approved condition or state of life, gives and must give in the world an outstanding witness and example of this same holiness.
40. The Lord Jesus, the divine Teacher and Model of all perfection, preached holiness of life to each and everyone of His disciples of every condition. He Himself stands as the author and consummator of this holiness of life: “Be you therefore perfect, even as your heavenly Father is perfect”. Indeed He sent the Holy Spirit upon all men that He might move them inwardly to love God with their whole heart and their whole soul, with all their mind and all their strength and that they might love each other as Christ loves them. The followers of Christ are called by God, not because of their works, but according to His own purpose and grace. They are justified in the Lord Jesus, because in the baptism of faith they truly become sons of God and sharers in the divine nature. In this way they are really made holy. Then too, by God’s gift, they must hold on to and complete in their lives this holiness they have received. They are warned by the Apostle to live “as becomes saints”, and to put on “as God’s chosen ones, holy and beloved a heart of mercy, kindness, humility, meekness, patience”, and to possess the fruit of the Spirit in holiness. Since truly we all offend in many things we all need God’s mercies continually and we all must daily pray: “Forgive us our debts”. Thus it is evident to everyone, that all the faithful of Christ of whatever rank or status, are called to the fullness of the Christian life and to the perfection of charity; by this holiness as such a more human manner of living is promoted in this earthly society. In order that the faithful may reach this perfection, they must use their strength accordingly as they have received it, as a gift from Christ. They must follow in His footsteps and conform themselves to His image seeking the will of the Father in all things. They must devote themselves with all their being to the glory of God and the service of their neighbor. In this way, the holiness of the People of God will grow into an abundant harvest of good, as is admirably shown by the life of so many saints in Church history. […]
Furthermore, married couples and Christian parents should follow their own proper path (to holiness) by faithful love. They should sustain one another in grace throughout the entire length of their lives. They should imbue their offspring, lovingly welcomed as God’s gift, with Christian doctrine and the evangelical virtues. In this manner, they offer all men the example of unwearyingly and generous love; in this way they build up the brotherhood of charity; in so doing, they stand as the witnesses and cooperators in the fruitfulness of Holy Mother Church; by such lives, they are a sign and a participation in that very love, with which Christ loved His Bride and for which He delivered Himself up for her. A like example, but one given in a different way, is that offered by widows and single people, who are able to make great contributions toward holiness and apostolic endeavor in the Church. Finally, those who engage in labor—and frequently it is of a heavy nature—should better themselves by their human labors. They should be of aid to their fellow citizens. They should raise all of society, and even creation itself, to a better mode of existence. Indeed, they should imitate by their lively charity, in their joyous hope and by their voluntary sharing of each others’ burdens, the very Christ who plied His hands with carpenter’s tools and Who in union with His Father, is continually working for the salvation of all men. In this, then, their daily work they should climb to the heights of holiness and apostolic activity.