We are taught by Celsus, that health is best preserved by avoiding settled habits of life, and deviating sometimes into slight aberrations from the laws of medicine; by varying the proportions of food and exercise, interrupting the successions of rest and labour, and mingling hardships with indulgence. The body, long accustomed to stated quantities and uniform periods, is disordered by the smallest irregularity; and since we cannot adjust every day by the balance or barometer, it is fit sometimes to depart from rigid accuracy, that we may be able to comply with necessary affairs, or strong inclinations. He that too long observes nice punctualities, condemns himself to voluntary imbecility, and will not long escape the miseries of disease. The same laxity of regimen is equally necessary to intellectual health, and to a perpetual susceptibility of occasional pleasure. Long confinement to the same company which perhaps similitude of taste brought first together, quickly contracts the faculties, and makes a thousand things offensive that are in themselves indifferent; a man accustomed to hear only the echo of his own sentiments, soon bars all the common avenues of delight, and has no part in the general gratifications of mankind. In things which are not immediately subject to religious or moral consideration, it is dangerous to be too rigidly in the right. Sensibility may, by an incessant attention to elegance and propriety, be quickened to a tenderness inconsistent with the condition of humanity, irritable by the smallest asperity, and vulnerable by the gentlest touch. He that pleases himself too much with minute exactness, and submits to endure nothing in accommodations, attendance, or address, below the point of perfection, will, whenever he enters the crowd of life, be harassed with innumerable distresses, from which those who have not in the same manner increased their sensations find no disturbance. His exotick softness will shrink at the coarseness of vulgar felicity, like a plant transplanted to northern nurseries, from the dews and sunshine of the tropical regions. There will always be a wide interval between practical and ideal excellence; and, therefore, if we allow not ourselves to be satisfied while we can perceive any errour or defect, we must refer our hopes of ease to some other period of existence. It is well known, that, exposed to a microscope, the smoothest polish of the most solid bodies discovers cavities and prominences; and that the softest bloom of roseate virginity repels the eye with excrescences and discolorations. The perceptions as well as the senses may be improved to our own disquiet, and we may, by diligent cultivation of the powers of dislike, raise in time an artificial fastidiousness, which shall fill the imagination with phantoms of turpitude, shew us the naked skeleton of every delight, and present us only with the pains of pleasure, and the deformities of beauty.