Insubordination may only be the evidence of a strong mind.

A weak man is just by accident. A strong but non-violent man is unjust by accident.

A lot of people have pretty little heads, but it's difficult to find a pretty little mind.

Sometimes you put walls up not to keep people out, but to see who cares enough to break them down.

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.

The sky is not the limit. Your mind is.