1 Corinthians 8:2

And if anyone thinks that he knows anything, he knows nothing yet as he ought to know.

Surrounding context

8:1 Now concerning things offered to idols: We know that we all have knowledge. Knowledge puffs up, but love edifies.

8:2 And if anyone thinks that he knows anything, he knows nothing yet as he ought to know.

8:3 But if anyone loves God, this one is known by Him.

Translation and sources