“In a moment of eternity, while the taste of redemption was still fresh to the former slaves, the people of Israel were given the Ten Words, the Ten Commandments. In the beginning and end the Decalogue deals with the liberty of man. The first word – I am the Lord thy God, who brought thee out of the land of Egypt, out of the house of bondage – reminds him that his outer liberty was given to him by God, and the tenth Word – Thou shalt not covet! – reminds him that he himself must achieve his inner liberty.”
and further along….
“We know that passion cannot be vanquished by decree. The tenth injunction would, therefore, be practically futile, were it not for the ‘commandment’ regarding the Sabbath day to which about a third of the Decalogue is devoted, and which is an epitome of all other commandments. We must seek to find a relation between the two ‘commandments’ Do not covet anything that belonging to thy neighbour; I have given thee something that belongs to Me. What is that something? A day.”
~ Rabbi Abraham Joshua Heschel – The Sabbath