Pay no mind to those who talk behind your back, it simply means that you are two steps ahead.

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 conscientiousness. Guard your own mind.

Mind is never a problem mindset is.

The strong man is the one who is able to intercept at will the communication between the senses and the mind.