Parallel
Hebrews 5:11
Nestle 1904 Greek New Testament · Berean Standard Bible
Περὶ οὗ πολὺς ἡμῖν ὁ λόγος καὶ δυσερμήνευτος λέγειν ἐπεὶ νωθροὶ γεγόνατε ταῖς ἀκοαῖς
We have much to say about this, but it is hard to explain, because you are dull of hearing.