'Ought' in the Bible

But if anyone thinks that he knows anything, he doesn't yet know as he ought to know.

or does he say it assuredly for our sake? Yes, it was written for our sake, because he who plows ought to plow in hope, and he who threshes in hope should partake of his hope.

For a man indeed ought not to have his head covered, because he is the image and glory of God, but the woman is the glory of the man.

For this cause the woman ought to have authority on her head, because of the angels.