Theology can be characterised as a work for sanctifying the life, a work that each Christian is called to fulfil. Achieving the holiness is a divine command for all of us. “I am the Lord your God; consecrate yourselves and be holy, because I am holy” (Leviticus 11:44) is written in the Old Testament. Saint Peter reiterates this command: “But just as he who called you is holy, so be holy in all you do; for it is written: Be holy, because I am holy” (1 Pieter 1:16). Holiness means to become the image of God as all of us were created, by uniting with Christ in the Holy Sacraments and renouncing to the sin that separates us from God.