Meditations by Marcus Aurelius Book 5 Page 15

and true liberty, and true simplicity, and equanimity, and holiness; whether these be not most kind and natural? And prudency itself, what more kind and amiable than it, when thou shalt truly consider with thyself, what it is through all the proper objects of thy rational intellectual faculty currently to go on without any fall or stumble? As for the things of the world, their true nature is in a manner so involved with obscurity, that unto many philosophers, and those no mean ones, they seemed altogether incomprehensible, and the Stoics themselves, though they judge them not altogether incomprehensible, yet scarce and not without much difficulty, comprehensible, so that all assent of ours is fallible, for who is he that is infallible in his conclusions?

From the nature of things, pass now unto their subjects and matter: