1 Corinthians 8:2

And if any man think that he knoweth any thing, he knoweth nothing yet as he ought to know.

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

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

and if any one doth think to know anything, he hath not yet known anything according as it behoveth `him' to know;

The one who thinks he knows something does not yet know as he ought to know.