Gospel of Matthew
“You have heard that it was said, ‘You shall love your neighbor and hate your enemy.’ But I say to you, Love your enemies and pray for those who persecute you, so that you may be children of your Father in heaven; for he makes his sun rise on the evil and on the good, and sends rain on the righteous and on the unrighteous. For if you love those who love you, what reward do you have? Do not even the tax collectors do the same? And if you greet only your brothers and sisters, what more are you doing than others? Do not even the Gentiles do the same? Be perfect, therefore, as your heavenly Father is perfect.
Matthew 5:43-48
Jesus said to him, “If you wish to be perfect, go, sell your possessions, and give the money to the poor, and you will have treasure in heaven; then come, follow me.”
Matthew 19:21
Old Testament
The Lord spoke to Moses, saying:
Leviticus 19:2-3
Speak to all the congregation of the people of Israel and say to them: You shall be holy, for I the Lord your God am holy.
When Abram was ninety-nine years old, the Lord appeared to Abram, and said to him, “I am God Almighty; walk before me, and be blameless.”
Genesis 17:1
Other sources
The universal call to holiness is rooted in baptism, and the Paschal Mystery, which configures a person to Jesus Christ who is truly God and truly man, thus uniting a person with the Second Person of the Blessed Trinity, bringing him in communion with intra-trinitarian life.
Universal Call to Holiness
this solitary life 