To measure other people's corn by one's own bushel. To make oneself the standard of right and wrong; to appraise everything as it accords or disagrees with one's own habits of thought and preconceived opinions; to be extremely bigoted and self-opiniated.
“Do men light a candle and put it under a bushel?” - Matt. v. 15.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894