John Calvin Commentary Isaiah 39:4

"Then said he, What have they seen in thy house? And Hezekiah answered, All that is in my house have they seen: there is nothing among my treasures that I have not showed them." — Isaiah 39:4 (ASV)

Then he said. Isaiah proceeds in his indirect admonition, to see if Hezekiah will be moved by it and displeased with himself. But still he does not succeed, though it can hardly be believed that the king was so dull as not to feel the punctures of the spur; for he knew that the Prophet had not come, as those addicted to curiosity are accustomed to do, for the purpose of seeking out news; and he also knew that the Prophet had not come to joke with him, but to state something of importance.

However that may be, we should interpret his mild reply favorably; for he does not lash out against the Prophet but modestly confesses the facts of the situation, though he does not yet acknowledge that he has sinned, or at least is not brought to repentance, because he does not judge his sin from that concealed disposition.

Ambition deludes people so much that by its sweetness it not only intoxicates but drives them mad, so that, even when they have been admonished, they do not immediately repent. Therefore, when we see the godly Hezekiah struck with such insensibility as not to perceive that he is being reproved, or at least not to be stung by it so as to understand himself, we should carefully guard against so dangerous a disease.