From A Calendar of Wisdom:
"Intellect can be enlightened only in a kind person. A person can be kind only when he has an enlightened intellect. One helps the other." -Chinese wisdom
And from The Daily Stoic:
"Kindness is invincible, but only when it’s sincere, with no hypocrisy or faking. For what can even the most malicious person do if you keep showing kindness and, if given the chance, you gently point out where they went wrong—right as they are trying to harm you?" -Marcus Aurelius