1 Corinthians 8:2

Εἰ δέ τις δοκεῖ εἰδέναι τι, οὐδέπω οὐδὲν ἔγνωκεν καθὼς δεῖ γνῶναι·

Ei de tis dokei eidenai ti, oydepō oyden egnōken kathōs dei gnōnai·

King James Version (KJV)

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

Modern English

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