The Protestant Reformation on Sabbath-Keeping

"What ingratitude is it, if, in yielding us six parts of the seven which we owe Him — we do not at the least strive with all our power to surrender the other part which He exacts of us as a token of our fidelity and homage! … Since we are permitted all other days of the week excepting this [Sabbath Day] for attending to our bodily concerns, it seems to me that we hold very cheap the service of God and the ministry of the Church on which we ought to wait more diligently than any other — if we cannot find means of employing one whole day of the week in the things which God requires of us upon it.