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These three principles thou must have in readiness: In the things which thou doest, do nothing either inconsiderately or otherwise than as justice herself would act; but with respect to what may happen to thee from without, consider that it happens either by chance or according to providence, and thou must neither blame chance nor accuse providence. Second, consider what every being is from the seed to the time of its receiving a soul, and from the reception of a soul to the giving back of the same, and of what things every being is compounded, and into what things it is resolved. Third, if thou shouldst suddenly be raised up above the earth, and shouldst look down on human things, and observe the variety of them how great it is, and at the same time also shouldst see at a glance how great is the number of beings who dwell all around in the air and the ether, consider that as often as thou shouldst be raised up, thou wouldst see the same things, sameness of form and shortness of duration. Are these things to be proud of?

Thou must have these three rules ready for use. Firstly, not to do anything, that thou doest, aimlessly, or otherwise than as Justice herself would have acted; and to realize that all that befalls thee from without is due either to Chance or to Providence, nor hast thou any call to blame Chance or to impeach Providence. Secondly this: to think what each creature is from conception till it receives a living soul, and from its reception of a living soul till its giving back of the same, and out of what it is built up and into what it is dissolved. Thirdly, that if carried suddenly into mid-heaven thou shouldest look down upon human affairs and their infinite diversity, thou wilt indeed despise them, seeing at the same time in one view how great is the host that peoples the air and the aether around thee; and that, however often thou wert lifted up on high, thou wouldst see the same sights, everything identical in kind, everything fleeting. Besides, the vanity of it all!