John Flavel (1628-1691) offers much in very few words:-
If therefore, in doubtful cases, you would discover God’s will, govern yourselves in your search after it by these rules:
1. Get the true fear of God upon your hearts; be really afraid of offending him.
2. Study the Word more, and the concerns and interests of the world less.
3. Reduce what you know into practice, and you shall know what is your duty to practice.…