All things will be produced in superior quantity and quality, and with greater ease, when each man works at a single occupation, in accordance with his natural gifts, and at the right moment, without meddling with anything else.
PlatoKnowledge of the soul is the only universal truth and the only wisdom - all other knowledge is transient.
PlatoShall we not, then, lay down a law, in the first place, that boys shall abstain altogether from wine till their eighteenth year, thereby teaching that it is wrong to add fire to fire, as through a funnel, pouring it into their body and soul before they proceed to the labor of life, thus exercising a caution as to the maddening habits of youth.
Plato