耶利米書 4:3 註釋：Rashi

For so said the Lord, etc. Plow for yourself a furrow Learn from the tillers of the soil, who plow it in the summer to kill the roots of the grasses, that it should not grow thorns at the time of sowing in the winter. You, too, improve your deeds before the evil befalls you, so that your prayer should not be rejected when you cry out.

and do not sow upon thorns And let not your cry before Me be from amidst wickedness, but from amidst repentance, that you shall not resemble one sowing without plowing, and that turns into thorns (kardons in O.F., chardons in modern French).