Break up your fallow ground, &c.— That is, "Purge and purify the field of your hearts by true repentance." See Deuteronomy 10:16. Romans 2:29. Exodus 6:12.Acts 7:51. Colossians 2:11 and Houb.
Related Commentaries of Jeremiah 4:3
Jeremiah 4:3
3 For thus saith the LORD to the men of Judah and Jerusalem, Break up your fallow ground, and sow not among thorns.