Calvin on the Weekly Christian Sabbath

This then was, and is, Rome's answer to the Reformation. This was, and is, the reply to the Reformed Church of the Deformed Church  alias that part of the Church that refused to reform (and still refuses to reform) according to God's Word. After the light of Luther at the dawn of the sixteenth century, there followed the darkness of Trent. Post lucem, tenebrae. But in the merciful providence of Almighty God, the Lord's day was again destined to be illuminated by the Sun of Righteousness (Mal. 4:2-4f). Post tenebras, Lux!

1 H.J.W. Legerton: The Church of Rome and the Lord's Day, Lord's Day Observance Society, London, 1957, pp 5-9.