“I’ll put my Law within them and will write it on their hearts. I’ll be their God and they will be my people.” – Jeremiah 31:33

The human conscience. Stop and really think about it. Why is it that everyone agrees killing others is wrong? Why can’t I just walk up to someone and shoot em? What makes something “wrong?”

The Commandments of God are written upon our hearts. That’s why.

One thing to remember, the Sixth is really “thou shalt not murder”.
Warfare and killing are even commanded just not murder.

The misinterpretation continues to this day.