'Opinions' in the Bible

In those days the opinions of Ahithophel were valued as highly as if through him a man might get direction from God; so were they valued by David as much as by Absalom.

And Elijah came near to all the people and said, How long will you go on balancing between two opinions? if the Lord is God, then give worship to him; but if Baal, give worship to him. And the people said not a word in answer.