They continued, singing,
"Christmas day is in our grasp so long as we have hands to clasp."
The Grinch could hardly believe his ears.
He begins to get furious, but then something happens.
He suddenly “puzzles” how Christmas came.
"It came without ribbons. It came without tags.
It came without packages, boxes, or bags."
Suddenly the Grinch realizes that Christmas is about more than presents, or decorations, or a feast.
He has a thought he’s never thought before:
"Maybe Christmas," he thought, "doesn’t come from a store; Maybe Christmas perhaps means a little bit more."
SOURCE: "How The Grinch Stole Christmas" by Dr. Suess