He who does not direct his own mind lacks mastery. ... If there is any self of which one can say, 'This is man', it is the mind. The three Sanskrit words Mana, Manu, Manusha show that man is his mind, is the product of his mind, and is also the controller of the activity of mind. If he does not control his mind, he is not a master but a slave. It lies with his own mind whether he shall be master, or whether he shall be slave. He is slave when he neglects to be master; he is master if he cares to be master.