'Opinion' in the Bible

Do you not know that we [believers] will judge angels? How much more then [as to] matters of this life?

Now concerning the virgins [of marriageable age] I have no command of the Lord, but I give my opinion as one who by the Lord’s mercy is trustworthy.

But in my opinion a widow is happier if she stays as she is. And I think that I also have the Spirit of God [in this matter].