But one man, even in a bad state of health, may be stronger than another even in a good one. Weakness is a common concomitant of disease: but in consequence of his radical frame of body, a man may be weak all his life long, without experiencing any disease. Health, as we have observed, is principally a negative circumstance: strength a positive one. The degree of a man's strength can be measured with tolerable accuracy.

IX. 3. Hardiness is a circumstance which, though closely connected with that of strength, is distinguishable from it. Hardiness is the absence of irritability. Irritability respects either pain, resulting from the action of mechanical causes; or disease, resulting from the action of causes purely physiological. Irritability, in the former sense, is the disposition to undergo a greater or less degree of pain upon the application of a mechanical cause; such as are most of those applications by which simple afflictive punishments are inflicted, as whipping, beating, and the like. In the latter sense, it is the disposition to contract disease with greater or less facility, upon the application of any instrument acting on the body by its physiological properties; as in the case of fevers, or of colds, or other inflammatory diseases, produced by the application of damp air: or to experience immediate uneasiness, as in the case of relaxation or chilliness produced by an over or under proportion of the matter of heat.

Hardiness, even in the sense in which it is opposed to the action of mechanical causes, is distinguishable from strength. The external indications of strength are the abundance and firmness of the muscular fibres: those of hardiness, in this sense, are the firmness of the muscular fibres, and the callosity of the skin. Strength is more peculiarly the gift of nature: hardiness, of education. Of two persons who have had, the one the education of a gentleman, the other, that of a common sailor, the first may be the stronger, at the same time that the other is the hardier.

X. 4. By bodily imperfection may be understood that condition which a person is in, who either stands distinguished by any remarkable deformity, or wants any of those parts or faculties, which the ordinary run of persons of the same sex and age are furnished with: who, for instance, has a hare-lip, is deaf, or has lost a hand. This circumstance, like that of ill-health, tends in general to diminish more or less the effect of any pleasurable circumstance, and to increase that of any afflictive one. The effect of this circumstance, however, admits of great variety: inasmuch as there are a great variety of ways in which a man may suffer in his personal appearance, and in his bodily organs and faculties: all which differences will be taken notice of in their proper places.

XI. 5. So much for circumstances belonging to the condition of the body: we come now to those which concern the condition of the mind: the use of mentioning these will be seen hereafter. In the first place may be reckoned the quantity and quality of the knowledge the person in question happens to possess: that is, of the ideas which he has actually in store, ready upon occasion to call to mind: meaning such ideas as are in some way or other of an interesting nature: that is, of a nature in some way or other to influence his happiness, or that of other men. When these ideas are many, and of importance, a man is said to be a man of knowledge; when few, or not of importance, ignorant.

XII. 6. By strength of intellectual powers may be understood the degree of facility which a man experiences in his endeavours to call to mind as well such ideas as have been already aggregated to his stock of knowledge, as any others, which, upon any occasion that may happen, he may conceive a desire to place there. It seems to be on some such occasion as this that the words parts and talents are commonly employed. To this head may be referred the several qualities of readiness of apprehension, accuracy and tenacity of memory, strength of attention, clearness of discernment, amplitude of comprehension, vividity and rapidity of imagination. Strength of intellectual powers, in general, seems to correspond pretty exactly to general strength of body: as any of these qualities in particular does to particular strength.

XIII. 7. Firmness of mind on the one hand, and irritability on the other, regard the proportion between the degrees of efficacy with which a man is acted upon by an exciting cause, of which the value lies chiefly in magnitude, and one of which the value lies chiefly in propinquity. A man may be said to be of a firm mind, when small pleasures or pains, which are present or near, do not affect him, in a greater proportion to their value, than greater pleasures or pains, which are uncertain or remote; of an irritable mind, when the contrary is the case.

XIV. 8.