In inventing a model we may assume what we wish, but should avoid impossibilities.
Excellence or virtue in a man will be the disposition which renders him a good man and also which will cause him to perform his function well.
Adoration is made out of a solitary soul occupying two bodies.
Happiness is the reward of virtue.
The line between lawful and unlawful abortion will be marked by the fact of having sensation and being alive.
If every tool, when ordered, or even of its own accord, could do the work that befits it... then there would be no need either of apprentices for the master workers or of slaves for the lords.