The Universal Call to Holiness and Apostolate is a teaching of the Roman Catholic Church that all people are called to be holy, and is based on Matthew 5:48 - "Be ye therefore perfect, as also thy heavenly Father is perfect."
The universal call to holiness has always been a teaching of the Church and is rooted in Her mission to take sinners and raise them from their sinful nature into saints by the glory and perfection of Jesus Christ. For, God does not choose us by our virtue or goodness, but by His infinite mercy and desire for all mens salvation. An example of this teaching can be found in the Introduction to the Devout Life of Francis de Sales. Written in the 17th century, it describes a method to approach holiness in everyday life.
Chapter V of the Dogmatic Constitution on the Church, Lumen gentium discusses the Universal Call to Holiness:
...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; ...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.
Pope Emeritus Benedict XVI spoke on the Universal Call to Holiness during his General Audience of Wednesday, 13 April 2011, saying:
"...The saints expressed in various ways the powerful and transforming presence of the Risen One. They let Jesus so totally overwhelm their life that they could say with St Paul “it is no longer I who live, but Christ who lives in me” (Gal 2:20). Following their example, seeking their intercession, entering into communion with them, “brings us closer to Christ, so our companionship with the saints joins us to Christ, from whom as from their fountain and head issue every grace and the life of the People of God itself” (cf. Second Vatican Council, Dogmatic Constitution on the Church, Lumen Gentium, n. 50).
At the end of this series of Catecheses, therefore, I would like to offer some thoughts on what holiness is. What does it mean to be holy? Who is called to be holy? We are often led to think that holiness is a goal reserved for a few elect. St Paul, instead, speaks of God’s great plan and says: “even as he (God) chose us in him [Christ] before the foundation of the world, that we should be holy and blameless before him” (Eph 1:4). And he was speaking about all of us. At the centre of the divine plan is Christ in whom. God shows his Face, in accord with the favour of his will. The Mystery hidden in the centuries is revealed in its fullness in the Word made flesh. And Paul then says: “in him all the fullness of God was pleased to dwell” (Col 1:19)...