A Sacrament is defined as "an outward sign of inward grace" which was instituted by Christ Himself and receives its power from God, through the merits of Christ.
- Baptism and Penance are known as the "Sacraments of the Dead" because before receiving them when needed, we are dead in sin.
- Confirmation, Holy Eucharist, Extreme Unction, Holy Orders, and Matrimony are known as the "Sacraments of the Living" because one must be in a state of grace to receive them licitly and receive their fruits; they give additional grace to souls already spiritually alive.
- Matrimony and Holy Orders are known as the "Social Sacraments" because they are designed primarily for the benefit of society and confer a social status.
- Baptism, Confirmation, and Holy Orders are the three Sacraments which leave an indelible mark on the recipient's soul and can never be repeated.