In relation to Bertha Mason Rochester's family, Mr. Rochester claims:
My bride's mother I had never seen: I understood she was dead. The honeymoon over, I learned my mistake; she was only mad, and shut up in a lunatic asylum. There was a younger brother, too--a complete dumb idiot. The elder one, whom you have seen (and whom I cannot hate, whilst I abhor all his kindred, because he has some grains of affection in his feeble mind, shown in the continued interest he takes in his wretched sister, and also in a dog-like attachment he once bore me), will probably be in the same state one day.
What does this quotation reveal about Victorian conceptions of mental health?