1 Corinthians 8:2

2 Those who think they know something do not yet know as they ought to know.

Read 1 Corinthians 8:2 Using Other Translations

And if any man think that he knoweth any thing, he knoweth nothing yet as he ought to know.
If anyone imagines that he knows something, he does not yet know as he ought to know.
Anyone who claims to know all the answers doesn’t really know very much.