Keeping the Lord's Day holy is obeying the 4th of the 10 commandments, which are commandments and not suggestions. And as Jesus states they are here until Heaven and Earth pass away (Matt 5:17-20). The church from the Book of Acts time gathered on the first day of the week, the day Jesus was resurrected, calling it the "Lord's Day" and set it aside as their sabbath - 1 Cor 16:1-2, Acts 20:7 & Rev 1:9, keeping it holy and wholly for God in worship, giving, Bible study, church, prayer, evangelising (and not for worldly things, sports, restaurants, shopping, TV etc). This is a most neglected command today, but it was not neglected in church history. Many of the greatest revivalists and reformers in Church history preached and kept the Lord's Day holy such as: John Wesley, DL Moody, Charles Spurgeon, David Livingston, William Wilberforce, Hudson Taylor, Charles Finney, William Booth, George Whitfield and many others who have massively impacted the church. In fact during times of revival it is highly significant that revivals where always accompanied by a renewal and revival of keeping the sabbath day (the Lord's day) as well.Exodus 20:8-11 (The 4th Commandment)"Remember the Sabbath day by keeping it holy. Six days you shall labor and do all your work, but the seventh day is a sabbath to the Lord your God. On it you shall not do any work, neither you, nor your son or daughter, nor your male or female servant, nor your animals, nor any foreigner residing in your towns. For in six days the Lord made the heavens and the earth, the sea, and all that is in them, but he rested on the seventh day. Therefore the Lord blessed the Sabbath day and made it holy."