Responding to who God is and what He has done.
In Christian liturgical tradition, the Magnificat is Mary's song in Luke 1:46-55. The liturgical title is derived from the Latin "magnificare," which means "to make great." Merriam-Webster simply defines a magnificat as "an utterance of praise."
Passages of reflection, remembrance, and celebration: John 1:1-5, 29-30; Luke 1:67-79; Isaiah 9:1-7; Luke 2:29-32; Exodus 15:1-21; 1 Samuel 2:1-10; 2 Samuel 23:1-7; Luke 1:46-55; Revelation 4:8-11, 5:8-14, 7:9-12, 11:15-17, 15:3-4, 19:1-7, 21:22-23; Romans 11:33-36).