Commandments on the Hearts

Deuteronomy 6:6
These commandments that I give you today are to be upon your hearts.

This verse is right in the middle of the Hear O Israel passage. It comes not long after the last verse, where God expressed His wish that hearts would be inclined to fear and obey. It comes right after verse 5: Love the LORD your God with all your heart and with all your soul and with all your strength.
I'm not sure how important it is, the distinction between heart and hearts, especially from one verse to the very next. Verse 5 may address general elements. Then, too, parts of the Bible just sound great, and this is one of those parts. Verse 5 wouldn't sound nearly so well if it said hearts and souls. It becomes very personal.
Verse 6 is a quick zoom out to the crowd, where every watching face has a heart, and every heart can be a small monument to the 10.
Actually, I quite like that idea. Rabid secularists may, like Saul before he was Paul, be raging from one courthouse to the next, sniffing out Ten Commandments on display, but they can never take them from our hearts.
And we teach them to our children, so they can't take them from them either!