Jeremiah 23:36 - Ellicott's Commentary On The Whole Bible

The burden of the Lord shall ye mention no more... — The misused term was no longer to be applied to the messages of Jehovah. If men continued to apply it to the words of their own heart, they would find it a “burden” in another sense (the prophet plays once more on the etymology of the word) too heavy to be borne. This would be the righteous punishment of the reckless levity with which they had treated the sacred Name which Jeremiah reproduces in all the amplitude of its grandeur. They had never realised the awfulness of speaking in the name “of the living God, the Lord of Sabaoth.”