The world of agriculture and working the land serves as a profound metaphor for prophetic rebuke and God's providence over the nation of Israel. Just as a farmer does not spend all his time merely preparing the soil without ever moving on to plant, the suffering and words of warning directed at the people are not an end in themselves. They do not last forever. Instead, they are a necessary phase designed to ready the soul for true spiritual growth.
The prophet asks a rhetorical question: does a farmer plow his field all day and all the time solely to prepare it for planting? [מצודת דוד, ביאור שטיינזלץ]. The primary approach among commentators is that the answer is clearly no, as plowing is strictly temporary. In the same way, the prophets who warn the people in order to bring them back to the right path will not continue their rebukes endlessly without result [רש"י, שד"ל]. Furthermore, the act of plowing represents the hardships that God brings upon the nation. These struggles are never the ultimate goal. Rather, they are meant to purify the people, strip away improper desires, and prepare the soul to accept wisdom and return to Him. The moment this goal is achieved, the suffering will cease, exactly as the plowing stops when the time for planting finally arrives [מלבי"ם, רד"ק].
Working the land before planting involves three distinct stages. The first is the initial plowing. Spiritually, this represents the uprooting of thorns and negative character traits that hold back the soul's development [מלבי"ם]. Following this is the process of opening the earth with a plow [רש"י, מצודת ציון]. This opening is necessary so the ground can properly hold the seed. In a parallel sense, the human soul is opened and made ready to absorb positive traits [מלבי"ם].
For the final stage of preparation, there are two main perspectives. The primary approach among commentators is that it describes the crushing and crumbling of hard clods of dirt [רד"ק, מצודת ציון, ביאור שטיינזלץ]. Conversely, others explain that it refers to the general repair and final preparation of the field [אבן עזרא, מצודת ציון, מנחת שי, מלבי"ם]. In the spiritual realm, crushing the hard clods of earth symbolizes breaking human stubbornness. It is the softening of the hardened parts of a person's nature through hardship, making them fully capable of receiving wisdom [מלבי"ם]. Some commentators add that the mention of these multiple steps simply emphasizes the thorough repair of the field [אבן עזרא], while others view it as a practical progression from creating wide furrows to smaller, more refined ones [רש"י].