Friends, I do not see a single thing that, when it’s not trained, with such untapped potential, is so very harmful as the mind. An untrained mind, with untapped potential, is very harmful.
Friends, I do not see a single thing that, when it is trained, with its potential realized, is so very beneficial as the mind. A trained mind, with its potential realized, is very beneficial.
𑁋Buddha Shakyamuni, Akammaniyavagga
Great Middle Way 