Adam Clarke on Jeremiah 31:36

If those ordinances - As sure as the sun shall give light to the day, and the moon to the night, so surely shall the Jews continue to be a distinct people. The same thing is expressed in other words in the next verse. Hitherto this prophecy has been literally fulfilled; the Jews are still a distinct people from all the dwellers upon earth. Every attempt that has been made in any country to naturalize and unite them with the people of that country, has proved abortive. The well-circumstanced attempt made this year (1830) in England, when the strongest interest was excited in their behalf, has also utterly failed. And why? Because of God's purpose expressed in Jer 31:35-37 of the Book of the Prophet Jeremiah.