"There is no Levitical decree between nations, and on this occasion I can see neither sin nor shame in marrying our own sister."

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Virtue depends partly upon training and partly upon practice; you must learn first, and then strengthen your learning by action. If this be true, not only do the doctrines of wisdom help us but the precepts also, which check and banish our emotions by a sort of official decree.

— Seneca the Younger