v1-2: Fruit "for himself," rather than for the Lord. As Israel prospered, he increased his altars and multiplied his idolatry, rather than giving praise to God. As a result, all that was gained will be lost.
v3-4: The people lose conviction and direction, realising that things have gone wrong.
v5: "Beth Aven," the house of vanity (4.15); a name for Bethel, the house of God. This is the place where one of the golden calves was placed, 2 Kings 10.29.
Even the glory of the idol is transitory, yet the people mourn for it, indicating their devotion towards it.
v6: The great king (King Jareb), 5.13, would take away the idols. This may be a reference to Tiglath-Pileser, or simply to Assyria. Even though a craftsman made the idol (8.6) the people put their trust in it; ultimately they would learn that an idol could never deliver them.
v7: Samaria, having lost its political power, floats away like a stick on a stream.
v8: Fear of judgment, as the people seek a place to hide. Those things they trust in prove useless.
v9-10: Judgment upon sins. Israel never really changed. Since the days of Gibeah, 9.9, they had not fully turned back to the Lord.
v11-12: Although God has spoken, giving wonderful promises, and He would work in their hearts and desires, there remains a responsibility upon the people to get right with God, setting their desires afresh upon Him.
These words follow the cry of 6.1-3, bringing fresh urgency, for the days of punishment are coming (9.7). The responsibility is clear, although we always need the Lord's help; we cannot leave it all to God, 'Let go and let God!'
In response to their repentance, the Lord will honour them, and rain righteousness on them.
The command is to "break up your unploughed ground." Israel was largely agricultural. The OT writers frequently use such images. The land was God's. Israelites were tenants, looking after His land. See also Jer 4.3.
v13: Past experience; they have sown wickedness, and reaped the consequences, 8.7-10.
v14-15: The only expectation is judgment, and they have already witnessed something of this.