CCC 2099

It is right to offer sacrifice to God as a sign of adoration and gratitude, supplication and communion: "Every action done so as to cling to God in communion of holiness, and thus achieve blessedness, is a true sacrifice." St. Augustine, De civ Dei 10, 6 PL — Patrologia Latina (Migne).

Read the full chapter 1. You Shall Love the Lord Your God with All Your Heart, and with All Your Soul, and with All Your Mind ¶2083–2195