Jeremiah 4:3

For thus saith the Lord to the men of Judah and Jerusalem
The two tribes of Judah and Benjamin, who were at the time of this prophecy in their own land; and so are distinguished from Israel the ten tribes, who were in captivity; unless the same persons should be meant, who were called by these several names, the people of the Jews; and it was in Judea that our Lord appeared in the flesh, and to the inhabitants thereof he ministered, he was the minister of the circumcision; and so to the inhabitants of Jerusalem, whom he called to repentance, and would have gathered, ( Matthew 23:37 ) : break up your fallow ground;
this is ground that lies untilled, not ploughed, nor sown, on which nothing grows but the produce of nature, as weeds, thorns, briers is common to men and beasts, and is trodden upon, and, so is hard and unsusceptible of seed; which, if it accidentally falls upon it, makes no impression on it, and is not received by it; and the breaking of it up is by the plough. The "fallow ground" fitly represents the hearts of unregenerate men, which are unopened to the word, and unbroken by it; nor have they the seed of divine grace sown in them; but are destitute of faith, hope, love, fear, and the like; there is nothing grows there but the weeds of sin and corruption; and are like a common beaten road; are the common track of sin, where lusts pass to and fro, and dwell; and so are hardened and obdurate, as hard as a stone, yea, harder than the nether millstone; and who, though they may occasionally be under the word, it makes no impression on them; it has no place in them, but is like the seed that falls by the wayside, ( Matthew 13:4 Matthew 13:19 ) , unless divine power attends it; for the Gospel is the plough, and ministers are the ploughmen; but it is the Lord alone that makes it effectual to the breaking up the fallow ground of men's hearts, ( Luke 9:62 ) ( Isaiah 61:5 ) ( 1 Corinthians 3:6 1 Corinthians 3:7 1 Corinthians 3:8 1 Corinthians 3:9 ) , but when the Lord puts his hand to the plough it enters within, and opens the heart; it is quick, powerful, and sharp; it cuts deep, and makes long and large furrows, even strong convictions of sin; it throws a man's inside outward, as the plough does the earth; and lays all the wicked of his heart open to him; and roots up the pride, the vanity, and boasting of the creature, and other lusts; and so makes way for the seed of divine grace to be sown there: and sow not among thorns;
or, "that ye may not sow among thorns" ^F15; for, unless the fallow ground is broken up, it will be no other than sowing among thorns; and unless the hearts of men are opened by the power and grace of God, they will not attend to the things that are spoken; preaching and eating the word will be like sowing among thorns; cares of this world, the deceitfulness of riches, the pleasures of life, and the lusts thereof, which are comparable to thorns, because pricking, perplexing, and distressing, and because vain and unprofitable, choke the word, and make it unfruitful; see ( Matthew 13:7 Matthew 13:22 ) , now this exhortation in the text does not suppose power in man to break up and open his heart; but to show his want of renewing grace; the necessity of it; and the danger he is in without it; and to awaken in him a concern for it; see ( Ezekiel 18:31 ) ( 36:26 ) . The words may be applied to backsliding professors, since backsliding Israel and Judah are the persons addressed; and this may be done with great propriety and pertinence to the simile; for fallow ground is that which has been broke up and sown, and laid fallow. It is usual to till and sow two years, and lay fallow a third: and backsliding Christians look very much like fallow ground; so faithless, so lukewarm, and indifferent; so inattentive to the word, and unconcerned under it; so barren and unfruitful, as if they had never had any faith, or love, or good work in them; so that they need to be renewed in the spirit of their minds; to have a new face of things put upon them: and to have a clean heart, and a right spirit, created in them. The Targum is,

``make to yourselves good works, and seek not salvation in sins.''