Holiness belongs first to God
God alone is holy by nature. Creatures become holy by participation: purified, elevated and united to him by grace. Christian veneration therefore praises God’s work in his servants.
Uncreated holiness and created participation by grace
God is holy by essence: His goodness is not received, measured or capable of increase. Angels and men are holy by participation, because grace purifies and elevates them into communion with God. The distinction excludes every deification of saints while explaining why their holiness can be real.
Christ's sacred humanity is personally united to the Son and is the instrumental source of grace for His members. Every saint's merit, virtue and glory therefore manifests the fruit of the one Redeemer.
- Isaiah 6:3
- John 1:14–18
- 2 Peter 1:4
- Hebrews 12:10
- Thomas Aquinas on grace

