By "dignity of the Sabbath," understand things like rest from work, church service attendance, etc. I don't know where Fr. Hopko is going talking about Saturday as the Sabbath, as if it was not a work day. It is a work day. We don't do much special for Saturdays, except that traditionally it is a day for remembering the dead, since on that day, Christ descended into hades and raised the dead. On Sundays, Christians traditionally do not do work for money, unless they have to--then some will often give that money to the poor. Sunday is a day for church, for spiritual things, for visiting people in hospitals, for hospitality, a day for the Lord just as the Jewish Saturday Sabbath was in many ways.