“Many a time and oft have I contemplated inwardly the wondrous works of the Creator of the universe: how in the beginning He formed the heavens and adorned them with goodly, shining stars, to which He gave power and might to influence everything under heaven. Also how He afterwards formed the four elements: fire, hot and dry—air, hot and moist—water, cold and moist—earth, dry and cold—and gave to each a nature of its own; and how after this the same Great Master of Nature made and formed herbs of many sorts and animals of all kinds, and last of all Man, the noblest of all created things. Thereupon I thought on the wondrous order which the Creator gave these same creatures of His, so that everything which has its being under heaven receives it from the stars, and keeps it by their help. I considered further how that in everything which arises, grows, lives or soars in the four elements named, be it metal, stone, herb or animal, the four natures of the elements, heat, cold, moistness and dryness are mingled. It is also to be noted that the four natures in question are also mixed and blended in the human body in a measure and temperament suitable to the life and nature of man. While man keeps within this measure, proportion or temperament, he is strong and healthy, but as soon as he steps or falls beyond the temperament or measure of the four natures, which happens when heat takes the upper hand and strives to stifle cold, or, on the contrary, when cold begins to suppress heat, or man becomes full of cold moisture, or again is deprived of the due measure of moisture, he falls of necessity into sickness, and draws nigh unto death. There are many causes of disturbances, such as I have mentioned, in the measure of the four elements which is essential to man’s health and life. In some cases it is the poisonous and hidden influence of the heavens acting against man’s nature, for from this arise impurity and poisoning of the air; in other cases the food and drink are unsuitable, or suitable but not taken in the right quantities, or at the right time. Of a truth I would as soon count thee the leaves on the trees, or the grains of sand in the sea, as the things which are the causes of a relapse from the temperament of the four natures, and a beginning of man’s sickness. It is for this reason that so many thousands and thousands of perils and dangers beset man. He is not fully sure of his health or his life for one moment. While considering these matters, I also remembered how the Creator of Nature, Who has placed us amid such dangers, has mercifully provided us with a remedy, that is with all kinds of herbs, animals and other created things to which He has given power and might to restore, produce, give and temper the four natures mentioned above. One herb is heating, another is cooling, each after the degree of its nature and complexion. In the same manner many other created things on the earth and in the water preserve man’s life,