keep in mind

“You may control a mad elephant; You may shut the mouth of the bear and the tiger; Ride the lion and play with the cobra; By alchemy you may learn your livelihood; You may wander through the universe incognito; Make vassals of the gods; be ever youthful; You may walk in water and live in fire; But control of the mind is better and more difficult.”

Paramahansa Yogananda, “Autobiography of a Yogi”