What is a saint in the Catholic Church?

The word "saint" in the Catholic Church typically refers to the group of holy souls who are united to God in Heaven.

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A canonized saint in the Catholic Church is a person who is officially recognized as having lived a life of heroic virtue while on earth.

The word itself is derived from the Latin word sanctus, meaning “holy,” and in general refers to all the faithful who strive after a life of holiness.

However, the most common usage is in referring to those men and women who lead exemplary lives of holiness.

The Catechism of the Catholic Church explains why the Church often singles out specific individuals with this title.

By canonizing some of the faithful, i.e., by solemnly proclaiming that they practiced heroic virtue and lived in fidelity to God’s grace, the Church recognizes the power of the Spirit of holiness within her and sustains the hope of believers by proposing the saints to them as models and intercessors. “The saints have always been the source and origin of renewal in the most difficult moments in the Church’s history.” Indeed, “holiness is the hidden source and infallible measure of her apostolic activity and missionary zeal.”
CCC 828

Were saints perfect?

Canonization doesn’t mean that the individual was perfect. Only Jesus and the Blessed Mother were conceived without the stain of sin and led lives of absolute perfection.

The key word in this discussion of saints is “heroic” virtue and refers to the saint’s ability to overcome sinful tendencies and temptations. They weren’t immune to sin, and many of them had to struggle for years to conquer their sinful passions.

Saints weren’t perfect. They made mistakes just like everybody else. What sets them apart with the title “saint” in the Catholic Church is that they did not stay down when they fell. By God’s grace, these holy men and women stood up, brushed off the dirt and kept moving forward. That is why we imitate them.