[50] Again: to him who arrives at virtue by his own good natural disposition, joy is given; for a good natural disposition is a thing to be rejoiced at, and so are the gifts of nature; since the mind derives enjoyment from all displays of acuteness and felicitous inventions, by which it finds the object which it is seeking without trouble; as if there was some prompter within enriching it with inventions; for the prompt discovery of matters previously, not certainly understood, is a subject of joy.