“Guard your thoughts very carefully, because thought can literally create a living thing.
The higher a faculty, the further it can reach. You can kick something with your foot, but you can throw it even higher with your hand. With your voice you can reach even further, calling to someone far away. Hearing reaches further still – you can hear sounds like gunfire from a very great distance. Vision reaches even further: you can see things high in the sky.
The higher the faculty, the further it can reach. Highest of all is the mind, which can ascend to the loftiest heights. You must therefore guard your mind and thoughts to the utmost.”

~ The Seven Beggars: & Other Kabbalistic Tales of Rebbe Nachman of Breslov