How do we move our hearts into a place where offer “no resistance” to those who are evil to us? I don’t think God is instructing us not to protect ourselves or those who may hurt us in a time of war or peril, but rather to have a open heart to all those who do evil and add pain to our lives.
I see this as almost having “forgiveness” built into to our nature, we do not judge, we might pray for those who are afflicted with “an uncaring heart” or “nature”. Of course we know that these things are also often a product of others treatment of them, either instructing them poorly, or setting an example that is not what God would want.
Today, perhaps we can examine who are treating in a less than forgiving way, that may lead us towards a purer heart.