'Opinion' in the Bible

I now pass to another subject. Receive as a friend a man whose faith is weak, but not for the purpose of deciding mere matters of opinion.

Concerning unmarried women I have no command to give you from the Lord; but I offer you my opinion, which is that of a man who, through the Lord's mercy, is deserving of your confidence.

For there must of necessity be differences of opinion among you, in order that it may be plainly seen who are the men of sterling worth among you.

But in this matter I give you an opinion; for my doing this helps forward your own intentions, seeing that not only have you begun operations, but a year ago you already had the desire to do so.