Albert Barnes Commentary Ezekiel 11:19-21

"And I will give them one heart, and I will put a new spirit within you; and I will take the stony heart out of their flesh, and will give them a heart of flesh; that they may walk in my statutes, and keep mine ordinances, and do them: and they shall be my people, and I will be their God. But as for them whose heart walketh after the heart of their detestable things and their abominations, I will bring their way upon their own heads, saith the Lord Jehovah." — Ezekiel 11:19-21 (ASV)

Compare Revelation 21:0. The identity of thought and language in Ezekiel, predicting the new kingdom of Israel, and in John, foretelling the kingdom of heaven, forces upon us the conclusion that the prophecy of Ezekiel has an ultimate reference to that climax which John plainly indicates.

Ezekiel 11:19

One heart – So long as the Israelites were distracted by the service of many gods, such unity was impossible; but now, when they have taken away the “abominations” from the land, they will be united in heart to serve the true God.

Stony heart ... heart of flesh – The heart unnaturally hardened, and the heart reawakened to feelings proper to man.