Joseph Andrew novel is about purity how good and bad characters are portray

Goodness/purity was a preoccupation of the littérateurs of the eighteenth century no less than of the moralists. In an age in which worldly authority was largely unaccountable and tended to be corrupt, Fielding seems to have judged that temporal power was not compatible with goodness. In his novels, most of the squires, magistrates, fashionable persons, and petty capitalists are either morally ambiguous or actively predatory; by contrast, his paragon of benevolence, Parson Adams, is quite poor and utterly dependent for his income on the patronage of squires. As a corollary of this antithesis, Fielding shows that Adams's extreme goodness, one ingredient of which is ingenuous expectation of goodness in others, makes him vulnerable to exploitation by unscrupulous worldlings. Much as the novelist seems to enjoy humiliating his clergyman, however, Adams remains a transcendently vital presence whose temporal weakness does not invalidate his moral power. If his naïve good nature is no antidote to the evils of hypocrisy and unprincipled self-interest, that is precisely because those evils are so pervasive; the impracticality of his laudable principles is a judgment not on Adams nor on goodness per se but on the world.