The universal call to holiness, from the Dogmatc Constitution on the Church,  Lumen Gentium:

     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 byt the gift of the Holy Spirit for God's glory. Thereford 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 edification of others, in a very special way this (holiness) appears in the practice of the counsels, cusomarily 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.

     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 consumator of this holiness of life: "Be you therefore perfect as your heavinly 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 whole soul, with all their mind and all their strength an tha tthey might love each other as Chris 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 of the divine nature. In this way they are really made holly. Then too, by God's gift, they must hold on to and complete in their lives their 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 mecy, kindess, humiilty, meekeness, patience", and to posses the fruit of the Spirit in holiness. Since truly w eall offend in many things we all need God's mercies to continually and we all must daily pray: "Forgive us out debts."

     Thus it is eveident to everyone, that all the faithful of Chrfist 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 gfit from Christ. They must follow in His footsteps and conform 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.