Rambam - Sefer HaMitzvos: Positive Mitzvah 155: Positive Mitzvah 155

Positive Mitzvah 155: Making Shabbat holy
Exodus 20:8 "Remember the Shabbat to keep it holy"

HaShem created the world in six days.

Upon completing the creation, He declared the seventh day to be special.

He proclaimed it holy, separating it from the rest of the week by not creating anything on that seventh day - the Shabbat.

The Torah wants us to regard the Shabbat as being holy.

Just as HaShem proclaimed it to be special, we are commanded to recite a special prayer when the Shabbat arrives - the Kiddush, and when it departs - the Havdalah.

These prayers remind us of the holiness and uniqueness of Shabbat.

Life is a game of hide and seek. G-d hides, we seek.
Everywhere in the world, parents play peek-a-boo with their children. It is a major discovery of life, a cornerstone in human development: To realize that something is there even when you cannot see it, that the world is not defined by your subjective perception, that there is something that absolutely is -- whether you know of it or not.
All our life, all of the world, is G-d playing with us that same game. He peeks with a miracle and then hides behind nature. Eventually, we look behind nature to find Him there.

From: Bringing Heaven Down to Earth by Tzvi Freeman - tzvif@aol.com