Pure of mind? Faithful and true. Pure intentions, pure thoughts untainted by base instincts greed, envy, false pride, etc., . And since every action is preceded by a thought if you don't remain pure of mind its inevitable that you will injure others, yourself, and the people you love.
Thats why one must circumcise the flesh of the foreskin of the mind, the yetzer ha-ra.
Blessed are the pure of mind for they shall see God.
Right. What Jesus was teaching is so easy to understand that if anyone, even entire villages, refused to acknowledge the truth, then their rejection was deliberate so why waste any time?
There is a choice between life and death, Moses said, "Choose life and live", so live and let die.
If you explained it forever they will never comprehend. THEY HAVE THEIR REWARD ALREADY.
There's no verse about pure of mind.
Read the sermon on the mount. Jesus addresses Roman occupation.