'Subject' in the Bible

Now as to things which have been sacrificed to idols. This is a subject which we already understand--because we all have knowledge of it. Knowledge, however, tends to make people conceited; it is love that builds us up.

It is important, brethren, that you should have clear knowledge on the subject of spiritual gifts.

But when the whole universe has been made subject to Him, then the Son Himself will also become subject to Him who has made the universe subject to Him, in order that GOD may be all in all.