When Bilam went to curse klal Yisroel, one of the things he wanted to say was “kallem” which translates to “destroy them.” The Tosafos in Avodah Zarah 4b brings that the letters of this word are kof-lamed-mem, which represent kaved, lev, and then moach. The curse would have been that klal Yisroel should be led by their desires and emotion. Hashem turned it around and made it melech which is spelled mem-lamed-kof and represents moach, lev, and kaved. We are blessed to be a melech when our emotions and desires are led by our intellect. The Torah is telling us that in order to become tzadikim, we must rule over our emotions and desires with our minds. I would suggest that one effective way of accomplishing this feat is by practicing mindfulness.