At the Creation, God instituted measurements for time -- since, until then, there was no need for time; for "the earth was without form, and void." He made day: from one sunset to next one. He made the month: from one new moon to the next one. He made seasons: based on the seed-time and harvest, and the weather. He also made the week: made up of seven sunset-to-sunset days. (See Genesis 1:13-15; Psalm 104:19-23; Isaiah 66:23; Genesis 8:20-22; Psalm 74:16-17; Genesis 2:1-3.)
All nature follows the pattern which God set up. In Psalm 104:19-23 (see above), even the beasts respond to the changes in time -- from day to night, from summer to winter. Why shouldn't we?
God loves us; and so He set up a time for us to come apart and and rest. He understands us: He both made us and became like us. Therefore, He knows that we need a break from our worldly care and labor. So He created the Sabbath. He wants us to take the time to get to know Him so that we may know to better reflect Him throughout the week. And each week, as we come closer to Him, we take on more of that "Sabbath attitude" throughout our daily interactions during the week. We become perfect in Christ. Always with room to grow, of course; but we would be constantly, consistently, and continually acting upon what we learn from the Master.
We may reach this perfection if we just take the time to sit at the feet of the Savior. God has for us a weekly appointment; and if we will accept it, and put it into our own calenders, what peace and joy will result!
"And he said unto them, Come ye yourselves apart into a desert place, and rest a while: for there were many coming and going, and they had no leisure so much as to eat."
(Mark 6:31 KJV)
"And Jesus answered and said unto her, Martha, Martha, thou art careful and troubled about many things: But one thing is needful: and Mary hath chosen that good part, which shall not be taken away from her."
(Luke 10:41-42 KJV)
"Peace I leave with you, my peace I give unto you: not as the world giveth, give I unto you. Let not your heart be troubled, neither let it be afraid."
(John 14:27 KJV)
"Come unto me, all ye that labour and are heavy laden, and I will give you rest. Take my yoke upon you, and learn of me; for I am meek and lowly in heart: and ye shall find rest unto your souls. For my yoke is easy, and my burden is light."
(Matthew 11:28-30 KJV)