The Church has her origin in the Holy Trinity, and that is the source of her holiness. In his plan for the salvation of humanity, God the Father willed the existence of the Church. Jesus Christ, the Son of God, established a community of disciples and died on the Cross for the forgiveness of sins. The Holy Spirit, sent by the Father and the Son, works within the Church to keep her members faithful to the Gospel. The Church is holy in her Founder, in her saints, and in her means of salvation.
Through Baptism and Confirmation, Catholics have become a people consecrated by the Holy Spirit to the praise of God through Jesus Christ. Christians grow in holiness by working to live in conformity to the Gospel of Jesus and thus to become more like him, especially in the totality of his love for others shown by his sacrifice of himself on the Cross. But Christians also remain subject to temptation and sin, thus needing God’s mercy and forgiveness. In teaching his disciples how to pray, Jesus included the following petition to the Father: “Forgive us our trespasses as we forgive those who trespass against us.”…
[T]he Sacraments, the Ten Commandments, the virtue of charity, and prayer [are also] presented as sources of holiness for the Church [in this Catechism].
You can read more from the United States Catholic Catechism for Adults, order your own copy, or read questions about it at the United States Conference of Catholic Bishops website.
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