How much our happiness depends upon our spirits, and these again upon our state of health, may be seen by comparing the influence which the same external circumstances or events have upon us when we are well and strong with the effects which they have when we are depressed and troubled with ill-health. It is not what things are objectively and in themselves, but what they are for us, in our way of looking at them, that makes us happy or the reverse. As Epictetus says, _Men are not influenced by things, but by their thoughts about things_. And, in general, nine-tenths of our happiness depends upon health alone. With health, everything is a source of pleasure; without it, nothing else, whatever it may be, is enjoyable; even the other personal blessings,--a great mind, a happy temperament--are degraded and dwarfed for want of it. So it is really with good reason that, when two people meet, the first thing they do is to inquire after each other's health, and to express the hope that it is good; for good health is by far the most important element in human happiness. It follows from all this that the greatest of follies is to sacrifice health for any other kind of happiness, whatever it may be, for gain, advancement, learning or fame, let alone, then, for fleeting sensual pleasures. Everything else should rather be postponed to it.

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 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_. 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_.

This is the difference which Plato draws between [Greek: eukolos] and [Greek: dyskolos]--the man of _easy_, and the man of _difficult_ disposition--in proof of which he refers to the varying degrees of susceptibility which different people show to pleasurable and painful impressions; so that one man will laugh at what makes another despair. As a rule, the stronger the susceptibility to unpleasant impressions, the weaker is the susceptibility to pleasant ones, and _vice versa_. If it is equally possible for an event to turn out well or ill, the [Greek: dyskolos] will be annoyed or grieved if the issue is unfavorable, and will not rejoice, should it be happy. On the other hand, the [Greek: eukolos] will neither worry nor fret over an unfavorable issue, but rejoice if it turns out well. If the one is successful in nine out of ten undertakings, he will not be pleased, but rather annoyed that one has miscarried; whilst the other, if only a single one succeeds, will manage to find consolation in the fact and remain cheerful. But here is another instance of the truth, that hardly any evil is entirely without its compensation; for the misfortunes and sufferings which the [Greek: auskoloi], that is, people of gloomy and anxious character, have to overcome, are, on the whole, more imaginary and therefore less real than those which befall the gay and careless; for a man who paints everything black, who constantly fears the worst and takes measures accordingly, will not be disappointed so often in this world, as one who always looks upon the bright side of things. And when a morbid affection of the nerves, or a derangement of the digestive organs, plays into the hands of an innate tendency to gloom, this tendency may reach such a height that permanent discomfort produces a weariness of life. So arises an inclination to suicide, which even the most trivial unpleasantness may actually bring about; nay, when the tendency attains its worst form, it may be occasioned by nothing in particular, but a man may resolve to put an end to his existence, simply because he is permanently unhappy, and then coolly and firmly carry out his determination; as may be seen by the way in which the sufferer, when placed under supervision, as he usually is, eagerly waits to seize the first unguarded moment, when, without a shudder, without a struggle or recoil, he may use the now natural and welcome means of effecting his release. Even the healthiest, perhaps even the most cheerful man, may resolve upon death under certain circumstances; when, for instance, his sufferings, or his fears of some inevitable misfortune, reach such a pitch as to outweigh the terrors of death. The only difference lies in the degree of suffering necessary to bring about the fatal act, a degree which will be high in the case of a cheerful, and low in that of a gloomy man. The greater the melancholy, the lower need the degree be; in the end, it may even sink to zero. But if a man is cheerful, and his spirits are supported by good health, it requires a high degree of suffering to make him lay hands upon himself. There are countless steps in the scale between the two extremes of suicide, the suicide which springs merely from a morbid intensification of innate gloom, and the suicide of the healthy and cheerful man, who has entirely objective grounds for putting an end to his existence.

[Footnote 1: For a detailed description of this condition of mind _Cf_ Esquirol, _Des maladies mentales_.]