Memorabilia

Similarly he recommended them to make themselves familiar with astronomy, but only so far as to be able to find the time of night, month and year, in order to use reliable evidence when planning a journey by land or sea, or setting the watch, and in all other affairs that are done in the night or month or year, by distinguishing the times and seasons aforesaid. This knowledge, again, was easily to be had from night hunters and pilots and others who made it their business to know such things.

But he strongly deprecated studying astronomy so far as to include the knowledge of bodies revolving in different courses, and of planets and comets, and wearing oneself out with the calculation of their distance from the earth, their periods of revolution and the causes of these. Of such researches, again he said that he could not see what useful purpose they served. He had indeed attended lectures on these subjects too; but these again, he said, were enough to occupy a lifetime to the complete exclusion of many useful studies.

In general, with regard to the phenomena of the heavens, he deprecated curiosity to learn how the deity contrives them: he held that their secrets could not be discovered by man, and believed that any attempt to search out what the gods had not chosen to reveal must be displeasing to them. He said that he who meddles with these matters runs the risk of losing his sanity as completely as Anaxagoras, who took an insane pride in his explanation of the divine machinery.

For that sage, in declaring the sun to be fire, ignored the facts than men can look at fire without inconvenience, but cannot gaze steadily at the sun; that their skin is blackened by the sun’s rays, but not by fire. Further, he ignored the fact that sunlight is essential to the health of all vegetation, whereas if anything is heated by fire it withers. Again, when he pronounced the sun to be a red-hot stone, he ignored the fact that a stone in fire neither glows nor can resist it long, whereas the sun shines with unequalled brilliance for ever.

He also recommended the study of arithmetic. But in this case as in the others he recommended avoidance of vain application; and invariably, whether theories or ascertained facts formed the subject of his conversation, he limited it to what was useful.

He also strongly urged his companions to take care of their health. You should find out all you can, he said, from those who know. Everyone should watch himself throughout his life, and notice what sort of meat and drink and what form of exercise suit his constitution, and how he should regulate them in order to enjoy good health. For by such attention to yourselves you can discover better than any doctor what suits your constitution.