The Third Commandment:  “You shall sanctify the holy Day.”

“Note, then, the power and force of this commandment consist not of the resting but of the sanctifying, so that this day should have its own particular holy work.  Other trades and occupations are not properly called holy work unless the doer himself is made holy.  But here a work must be performed by which the doer himself is made holy; this, as we have heard, takes place only through God’s Word.”