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 YoganandaNever do anything that taints your mind. Wrong actions cause negative or evil mental vibrations that are reflected in your whole appearance and personality. Engage in those actions and thoughts that nurture the good qualities you want to have.
Paramahansa Yogananda