The Sabbath is a memorial to the awesome creative power of Almighty God, a period of time God purposefully sanctified and set apart for the benefit of mankind, a time God shifted His creative effort onto an even more awesome spiritual plane, the process of reproducing Himself. The seventh day is holy (sanctified, set apart as a perpetual covenant- a sign identifying His people), because God's presence makes it so- not because mankind has arbitrarily chosen this time. Only God can sanctify. God uses this appointed holy time to prepare His people with needed instruction to become like Him. Sabbath keeping binds us to God (and fellow members of the family of God); Sabbath breaking cuts people off from God, leading automatically into idolatry.