Book I · 8
From Apollonius8 I learned freedom of will and undeviating steadiness of purpose; and to look to nothing else, not even for a moment, except to reason; and to be always the same, in sharp pains, on the occasion of the loss of a child, and in long illness; and to see clearly in a living example that the same man can be both most resolute and yielding, and not peevish in giving his instruction; and to have had before my eyes a man who clearly considered his experience and his skill in expounding philosophical principles as the smallest of his merits; and from him I learned how to receive from friends what are esteemed favors, without being either humbled by them or letting them pass unnoticed.
From Apollonius, self-reliance and an unequivocal determination not to leave anything to chance; and to look to nothing else even for a moment save Reason alone; and to remain ever the same, in the throes of pain, on the loss of a child, during a lingering illness; and to see plainly from a living example that one and the same man can be very vehement and yet gentle: not to be impatient in instructing others; and to see in him a man who obviously counted as the least among his gifts his practical experience and facility in imparting philosophic truths; and to learn in accepting seeming favours from friends not to give up our independence for such things nor take them callously as a matter of course.