Appreciating the Sabbath
Said the Gerer Rabbi: "We say in the Shabbat morning prayer: 'May Moses rejoice in the gift of his lot.' When the giver of a gift sees that the recipient appreciates it by caring for it earnestly, he rejoices. Likewise, when Moses discoverst that Israel appreciates the Sabbath and Holydays, which he presented to us, he is pleased."
Source: Siach Sarfei Kodesh