The Lord’s Day is God’s gift to us for the health of our souls and of the souls of others, and we must appreciate, honor, and use it accordingly. It is a day of spiritual opportunity, because it is the day of united worship; it is in the worship together of His people that God specifically makes Himself known. The Puritans, who used to called the Lord’s Day “the market-day of the soul,” the high spot of the week, believed that a well-spent Lord’s Day was a necessary preparation for the six days’ work that would then follow, and that Christians simply could not afford to treat the day as trivial and reduce it to routine.
From A Passion for Faithfulness by J.I. Packer (p. 191)