The one is independent of the other.

The body may fear and tremble, while the mind is calm and courageous, or vice versa.

This is the key to many moral eccentricities.

When the two are united in one man, that man will be a cipher all his life; such double-sided timidity makes him what we call "an imbecile." Often fine suppressed qualities are hidden within that imbecile.

To this double infirmity we may, perhaps, owe the lives of certain monks who lived in ecstasy; for this unfortunate moral and physical disposition is produced quite as much by the perfection of the soul and of the organs, as by defects which are still unstudied.
The timidity of Jean-Jacques came from a certain torpor of his faculties, which a great teacher or a great surgeon, like Despleins, would have roused.