to a natural subjection, consent that he should tremble at the terrible
noise of thunder, or the sudden clatter of some falling ruin, and be
affrighted even to paleness and convulsion; and so in other passions,
provided his judgment remain sound and entire, and that the seat of his
reason suffer no concussion nor alteration, and that he yield no consent
to his fright and discomposure. To him who is not a philosopher, a
fright is the same thing in the first part of it, but quite another thing
in the second; for the impression of passions does not remain
superficially in him, but penetrates farther, even to the very seat of
reason, infecting and corrupting it, so that he judges according to his
fear, and conforms his behaviour to it. In this verse you may see the
true state of the wise Stoic learnedly and plainly expressed:--

"Mens immota manet; lachrymae volvuntur inanes."

["Though tears flow, the mind remains unmoved."
--Virgil, AEneid, iv. 449]

The Peripatetic sage does not exempt himself totally from perturbations
of mind, but he moderates them.