And again, be it observed, that we are demanding no mathematical accuracy.

We demand only that the presentation shall be accurate enough to let us recognise its corresponding fact in life.
Now what is a code of morals, and why has the world any need of one?
A code of morals is a number of restraining orders; it rigorously bids us walk in certain paths.

But why?
What is the use of bidding us?
Because there are a number of other paths that we are naturally inclined to walk in.

The right path is right because it leads to the highest kind of happiness; the wrong paths are wrong because they lead to lower kinds of happiness.

But when men choose vice instead of virtue, what is happening?
They are considering the lower or the lesser happiness better than the greater or the higher.