1 Corinthians 8:2

And if any man think that he knoweth any thing, he knoweth nothing yet as he ought to know.
— 1 Corinthians 8:2, King James Version

In other translations

World English Bible (WEB)

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

American Standard Version (ASV)

If any man thinketh that he knoweth anything, he knoweth not yet as he ought to know;

Young's Literal Translation (YLT)

and if any one doth think to know anything, he hath not yet known anything according as it behoveth <FI>him<Fi> to know;