HERMAN MELVILLE - THE CONFIDENCE MAN
http://www.online-literature.com/melville/confidence-man/12It appeared that the unfortunate man had had for a wife one of those natures, anomalously vicious, which would almost tempt a metaphysical lover of our species to doubt whether the human form be, in all cases, conclusive evidence of humanity, whether, sometimes, it may not be a kind of unpledged and indifferent tabernacle, and whether, once for all to crush the saying of Thrasea, (an unaccountable one, considering that he himself was so good a man) that "he who hates vice, hates humanity," it should not, in self-defense, be held for a reasonable maxim, that none but the good are human.
What does he mean by "it may not be a kind of unpledged and indifferent tabernacle"?