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 by giving them dainties. Are we not told that Daniel and his companions, the youths of noble birth who had to apply themselves to the pursuit of wisdom, lived on a diet of pulse and water, and that they were found to be more capable and more active, and, what is of greater value, more intelligent, than all the other youths who ate of the king’s meat? (Daniel i. 12 sqq.) But of these particulars we will speak in another place.

11. A tree must also transpire, and needs to be copiously refreshed by wind, rain, and frost; otherwise it easily falls into bad condition, and becomes barren. In the same way the human body needs movement, excitement, and exercise, and in daily life these must be supplied, either artificially or naturally.

12. Finally, a tree needs rest at stated periods, that it may not have to put forth branches, blossoms, and fruit perpetually, but may have some time to fulfil its inner functions, to develope sap, and in this way to strengthen itself. It was for this reason that God ordained that winter should follow summer, namely, to guarantee rest to all things that live on the earth, and even to the earth itself, since he commanded that the fields should lie fallow every seventh year (Lev. xxv.) In the same way He has ordained the night for man, and for other animals, in order that, by sleep and by resting their limbs, they may once more gather together the strength which the exertions of the day have dissipated. Even the smaller periods, such as the hours, are devised with a view to giving the body and the mind some relaxation; otherwise a strained and unnatural condition would set in. It is, therefore, useful to intersperse the labours of the day with recreation, amusements, games, merriment, music, and such-like diversions, and thus to refresh the inner and the outer senses.

13. He who observes these three principles (that is to say, eats moderately, exercises his body, and uses the relaxations supplied by nature) cannot fail to preserve his life and his health as long as possible. We naturally leave