All men by nature desire knowledge.
The ideal man, takes joy in doing favours for others; but he feels ashamed to have others do favours for him. For it is a mark of superiority to confer a kindness; but it is a mark of inferiority to receive it.
Our first presupposition must be that in nature nothing acts on, or is acted on by, any other thing at random, nor may anything come from anything else, unless we mean that it does so in virtue of a concomitant attribute.
For there are two reasons why human beings face danger calmly: they may have no experience of it, or they may have means to deal with it: thus when in danger at sea people may feel confident about what will happen either because they have no experience of bad weather, or because their experience gives them the means of dealing with it.