She could act also; and suddenly, when conversation flagged or suggested it, she could throw herself into the part of Medea or Antigone, with a force and truth which far surpassed the effect produced by the male and masked representations of those characters at the theatre. Brother and sister were Œdipus and Antigone, Electra and Orestes, Cassandra and the Chorus. Once or twice they attempted a scene in Menander; but there was something which made Agellius shrink from the comedy, beautiful as it was, and clever as was the representation. Callista could act Thais as truly as Iphigenia, but Agellius could not listen as composedly. There are certain most delicate instincts and perceptions in us which act as first principles, and which, once effaced, can never, except from some supernatural source, be restored to the mind. When men are in a state of nature, these are sinned against, and vanish very soon, at so early a date in the history of the individual that perhaps he does not recollect that he ever possessed them; and since, like other first principles, they are but very partially capable of proof, a general scepticism prevails both as to their existence and their truth. The Greeks, partly from the vivacity of their intellect, partly from their passion for the beautiful, lost these celestial adumbrations sooner than other nations. When a collision arose on such matters between Agellius and his friends, Callista kept silence; but Aristo was not slow to express his wonder that the young Christian should think customs or practices wrong which, in his view of the matter, were as unblamable and natural as eating, drinking, or sleeping. His own face became almost satirical as Agellius’s became grave; however, he was too companionable and good-natured to force another to be happy in his own way; he imputed to the extravagance of his friend’s religion what in any but a Christian he would have called moroseness and misanthropy; and he bade his sister give over representations which, instead of enlivening the passing hour, did but inflict pain.