We must compare this verse with verse 22. Here it is the “hand” (3709/3027) of the “diligent” (2742a) that makes us “rich” (6238). There, it is God.
(Proverbs 10:22 KJV) The blessing of the LORD, it maketh rich, and he addeth no sorrow with it.We see that again many of God’s principles are two edged swords. We like to see only one side, but God is much more complex and practical. God blesses. Grace is extended. There are reasons that God chooses to extend His blessing. It is not because we are “negligent” (7423b). It is not in spite of our negligence. God is not capricious or inconsistent. There may be times when God extends blessing to those who are not working hard, but those are the exceptions, not the rule.
This is important because it is a principle that applies to our salvation. We have the conflict between grace and works. Some people think only grace is important, others think both have a role. The Bible clearly says we are saved by grace. That means it is a gift. That gift is not earned. God chooses to give it. The question for all believers is how does He choose. First, He chooses those who believe and trust in Jesus and His shed blood. The Calvinist seems to stop there theologically although many stress obedience for some reason I can’t figure out. The Arminian says that obedience is required. Don’t listen to either one. Read for yourself and make you own decision.