But however much health may contribute to that flow of good spirits
which is so essential to our happiness, good spirits do not entirely
depend upon health; for a man may be perfectly sound in his physique
and still possess a melancholy temperament and be generally given up
to sad thoughts. The ultimate cause of this is undoubtedly to be
found in innate, and therefore unalterable, physical constitution,
especially in the more or less normal relation of a man's
sensitiveness to his muscular and vital energy. Abnormal sensitiveness
produces inequality of spirits, a predominating melancholy, with
periodical fits of unrestrained liveliness. A genius is one whose
nervous power or sensitiveness is largely in excess; as Aristotle[1]
has very correctly observed, _Men distinguished in philosophy,
politics, poetry or art appear to be all of a melancholy temperament_.
This is doubtless the passage which Cicero has in his mind when
he says, as he often does, _Aristoteles ait omnes ingeniosos
melancholicos esse_.[2] Shakespeare has very neatly expressed this
radical and innate diversity of temperament in those lines in _The
Merchant of Venice_:
[Footnote 1: Probl. xxx., ep. 1]
[Footnote 2: Tusc. i., 33.]
_Nature has framed strange fellows in her time;
Some that will evermore peep through their eyes,
And laugh, like parrots at a bag-piper;
And others of such vinegar aspect,
That they'll not show their teeth in way of smile,
Though Nestor swear the jest be laughable_.
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