A good life for any living thing depends on what it needs to fulfil its nature. The good life is relative to this nature, not to opinion or convention. As Pascal observed, human beings are unusual in having a second nature formed by custom, along with the nature they have when they are born. It is natural for them to mistake their second nature for the first, and many who lived by the customs of their societies have lived badly as a result. Mistaking their own nature is not a habit of cats.
