In countries enlightened by the gospel, however, the most formidable
and (it is to be feared) the most frequent impediment to men's turning
the mind inward upon themselves, is that they are afraid of what they
shall find there. There is an aching hollowness in the bosom, a dark
cold speck at the heart, an obscure and boding sense of somewhat, that
must be kept _out of sight_ of the conscience; some secret lodger,
whom they can neither resolve to eject or retain.[23]