From the Heidelberg Catechism for the Lord’s Day, November 3

The Tenth  Commandment

“You shall not covet your neighbor’s house; you shall not covet your neighbor’s wife, nor his male servant, nor his female servant, nor his ox, nor his donkey, nor anything that is your neighbors.”

113. What does the tenth Commandment require?

That not even the least inclination or thought against any commandment of God ever enter our heart, but that with our whole heart we continually hate all sin and take pleasure in all righteousness.

114. Can those who are converted to God keep these Commandments perfectly?

No, but even the holiest men, while in this life, have only a small beginning of such obedience, yet so that with earnest purpose they begin to live not only according to some, but according to all the Commandments of God.

115. Why then does God so strictly enjoin the Ten Commandments upon us, since in this life no one can keep them?

First, that as long as we live we may learn more and more to know our sinful nature, and so the more earnestly seek forgiveness of sins and righteousness in Christ; second, that without ceasing we diligently ask God for the grace of the Holy Spirit, that we be renewed more and more after the image of God, until we attain the goal of perfection after this life.