Does the heart need a restraint?
Yes.

For it is desperately wicked,
Jeremiah 17:9

And does the law of God lay a restraint upon the heart?
Yes.

For the law is spiritual,
Romans 7:14

And will a restraint upon the sins of the heart be the most effectual preservative from all other sins?
Yes.

Cleanse first that which is within the cup or platter, that the outside may be clean also,
Matthew 23:26

Are we forbidden to covet another man’s house?
Yes.

As they that covet houses and take them away,
Micah 2:2

Or another man’s wife?
Yes.

As David did, who seeing Bathsheba, the wife of Uriah, sent and inquired after her,
2 Samuel 11:3

Or another man’s goods?
Yes.

I have coveted no man’s silver, or gold, or apparel,
Acts 20:33