Aurelius, Meditations §aur_12_vi: Let these be the objects of thy ordinary meditation: to consider, what manner...

Let these be the objects of thy ordinary meditation: to consider, what manner of men both for soul and body we ought to be, whensoever death shall surprise us: the shortness of this our mortal life: the immense vastness of the time that hath been before, and will he after us: the frailty of every worldly material object: all these things to consider, and behold clearly in themselves, all disguisement of external outside being removed and taken away. Again, to consider the efficient causes of all things: the proper ends and references of all actions: what pain is in itself; what pleasure, what death: what fame or honour, how every man is the true and proper ground of his own rest and tranquillity, and that no man can truly be hindered by any other: that all is but conceit and opinion. As for the use of thy dogmata, thou must carry thyself in the practice of them, rather like unto a pancratiastes, or one that at the same time both fights and wrestles with hands and feet, than a gladiator. For this, if he lose his sword that he fights with, he is gone: whereas the other hath still his hand free, which he may easily turn and manage at his will.