There is nothing so disobedient as an undisciplined mind, and there is nothing so obedient as a disciplined mind.

More than those who hate you, more than all your enemies, an undisciplined mind does greater harm.

Be devoted to heedfulness. Guard your mind.

The mind is everything. What you think you become.

All wrong-doing arises because of mind. If mind is transformed can wrong-doing remain?

Let us consider, first, the need for a tough mind, characterized by incisive thinking, realistic appraisal, and decisive judgment. The tough mind is sharp and penetrating, breaking through the crust of legends and myths and sifting the true from the false.