"Remember, the governing part becomes invincible, when collected
into itself, it can be satisfied with acting only as it pleases, even when it is
obstinately set upon things unreasonable. What shall it be then, when,
after due deliberation, it has fixed its judgment according to reason? The
soul, thus free from passions, is a strong fort; nor can a man find any
stronger, to which he can fly, and become invincible for the future. He
who has not discerned this, is illiterate. He who has, and does not fly to
it, is miserable." - Marcus Aurelius, Meditations.