From the EF Collect of The Immaculate Conception
O God, who, by the Immaculate Conception of the Virgin, didst make her a worthy habitation for Thy Son, and didst, by His foreseen death, preserve her from all stain of sin; grant, we beseech Thee, that through her intercession we may be cleansed from sin and come with pure hearts to Thee; Through the same our Lord.
The priest at Mass said that Mary's entire existence, from conception on, was one long YES to God.
Beautiful.
