Among the several qualifications of a good friend, this wise man has very justly singled out constancy and faithfulness as the princial: to these, other have added virtue, knowledge, discretion, equality in age and fortune, and as Cicero calls it, “a pleasantness of temper.” If I were to give my opinion upon such an exhausted subject, I should join to these other qualifications a certain equability or evenness of behaviour. A man often contracts a friendship with one whom perhaps he does not find out till after a year's conversation; when on a sudden some latent ill-humour breaks out upon him, which he never discovered or suspected at his first entering into an intimacy with him. There are several persons who in some certain periods of their lives are inexpressibly agreeable, and in others as odious and detestable.Martial has given us a very pretty picture of one of this species, in the following epigram:
“In all thy humours, whether grave or mellow,
Thou'rt such a touchy,testy, pleasant fellow;
Hast so much wit, and mirth, and spleen about thee,
There is no living with thee, nor without thee.”