Full Idea
It is necessary to know first whether a thing is right in order to know from thence whether it be conformable to the will of God.
Gist of Idea
We must judge a thing morally to know if it conforms to God's will
Source
Jeremy Bentham (Intro to Principles of Morals and Legislation [1789], II.18)
Book Reference
Mill,John Stuart: 'Utilitarianism (including On Liberty etc)', ed/tr. Warnock,Mary [Fontana 1962], p.56