"Of all this the beginning and the greatest good is prudence. Wherefore prudence is a more precious thing even than philosophy: for from prudence are sprung all the other virtues, and it teaches us that it is not possible to live pleasantly without living prudently and honorably and justly, (nor, again, to live a life of prudence, honor, and justice) without living pleasantly. For the virtues are by nature bound up with the pleasant life, and the pleasant life is inseparable from them." - Letter to Menoeceus
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"Yes, just as we regard with favour the physician's skill not for his art's sake merely but because we prize sound health, and just as the pilot's art is praised on utilitarian and not on artistic grounds, because it supplies the principles of good navigation, so wisdom, which we must hold to be the art of living, would be no object of desire, if it were productive of no advantage; but it is in fact desired, because it is to us as an architect that plans and accomplishes pleasure." - Cicero "On Ends" Torquatus section.