Jeremiah 17:12 - Matthew Poole's English Annotations on the Holy Bible

It is much more hard to give an account of the connexion of these words with the former, than of their sense considered absolutely in themselves. Some would have them the words of the people, reckoning up another vain ground of their confidence, because they had amongst them the temple of the Lord, which we know was what they mightily gloried in. Others would have them the words of the prophet owning his and the good Jews confidence to be only in God, and themselves to worship God not in groves or high places, but only in that place which he had chosen to be worshipped in, even in his sanctuary or temple. Many other conjectures there are, but these two seem to me the most probable.