[60] For it is the use and enjoyment of virtue that is happiness, and not the bare possession of it. But I should not be able to use it unless you, by letting down the seeds from heaven, had yourself made virtue pregnant; and unless she had brought forth the germs of happiness, namely, Isaac. And I consider that happiness is the employment of perfect virtue in a perfect life. In reference to which he, approving of his own determination, promises that he will complete perfectly all that he asked.