It has been the belief of certain kindly philosophers that if the one
half of mankind knew how the other half lived, the two halves might be
brought together in a family affection not now so observable in human
relations. Probably if this knowledge were perfect, there would still be
things, to bar the perfect brotherhood; and yet the knowledge itself is
so interesting, if not so salutary as it has been imagined, that one can
hardly refuse to impart it if one has it, and can reasonably hope, in the
advantage of the ignorant, to find one’s excuse with the better informed.