1 Corinthians 11:8

For the man is not of the woman: but the woman of the man (KJV)

Then: Paul is justifying and explaining the basis of his reasoning about the concept of glory. For Jewish Christians it would have been obvious. For former gentiles, less so. Their knowledge about the creation would have been spotty.

Now: Those who know the Old Testament have no trouble realizing Paul is talking about the creation. Others might need clarification. The verse is the foremost justification for male authority over women when the understanding of headship is "boss," not "source."