“The man who makes everything that leads to happiness depends upon himself, and not upon other men, has adopted the very best plan for living happily. This is the man of moderation, the man of manly character and of wisdom.”
More from Plato
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“Wise men speak because they have something to say; Fools because they have to say something.”
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“Wisdom alone is the science of other sciences.”
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“A good decision is based on knowledge and not on numbers.”
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“Bodily exercise, when compulsory, does no harm to the body; but knowledge which is acquired under compulsion obtains no hold on the mind.”
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“Wise men talk because they have something to say; fools, because they have to say something.”