Commentators explain that the phrase "spake yet more" indicates the author of Chronicles is summarizing a longer series of blasphemous speeches. The full, detailed accounts can be found in 2 Kings 18 and Isaiah 36. The Chronicler's goal is to capture the essence of the attack: a direct verbal assault not just on King Hezekiah, but, as one scholar notes, specifically "against Jehovah the (true) God."