Saint Faustina understood the Virgin Mary, at the supreme moment of human history — that is, the Incarnation — to be a lesson in trusting God's merciful plan of salvation: "She [Mary] believes the words of God's messenger and is confirmed in trust" (Diary, 1746). In this, Mary serves as a model and teacher of the interior life and of that wondrous virtue called trust. In fact, St. Faustina often referred to Mary as a model: "You are the model of my life" (874) and "I model my life on you" (1232).