Many people use time set aside for rest to do things that deprive of rest. This compounds the need for rest and the problems associated with not getting any.
The Sabbath was a sign between the Lord and Israel, but it also demonstrates a principle that man needs a period set aside to rest.
God places a high value on life. His desire was for man to be fruitful and multiply and bring forth abundantly in the earth (Genesis 9:7).
