You can chain me, you can torture me, you can even destroy this body, but you will never imprison my mind.

Insubordination may only be the evidence of a strong mind.

Be devoted to heedfulness. Guard your mind.

A mind all logic is like a knife all blade. It makes the hand bleed that uses it.

A man can wear out a particular part of his mind by continually using and tiring it, just in the same way he can wear out the elbows of his coat.

Culture of the mind must be subservient to the heart.