What does Proverbs 19:21 Mean?

Proverbs 19:21 sets up a contrast between human and divine ideas. If we pay attention to the grammar and what is implied, we can get a better grasp of this verse.

The human mind may devise many plans, 

but it is the purpose of the Lord that will be established. (Prov 19:21 NRSV)

First, notice the use of the singular and the plural. Human plans are plural. The Lord's advice is singular.

As humans, we make plans, and we struggle with certainty about anything. We're seldom exactly sure which step we should take next. The Lord's purpose is sure. He knows what we should and should not do.

Second, and most obviously, there is a sharp contrast between human and divine thoughts. It makes me think of Isaiah 55:8-9, when the Lord reminds the people:

For my thoughts are not your thoughts, nor are your ways my ways, says the LORD. For as the heavens are higher than the earth, so are my ways higher than your ways and my thoughts than your thoughts.

Third, there is an unstated implication in the second half of this verse. If the Lord's thoughts "will stand," it is implied that human thoughts will not stand forever.

The Septuagint, which is the Greek translation of the Old Testament, translates "will stand" as "will abide forever." It's not just that God's advice will be proven correct. It's that God's advice is eternally sound.

With this contrast between human and divine ideas in place, I am drawn back to Psalm 1:1

Why would we "follow the advice of the wicked, or take the path that sinners tread, or sit in the seat of scoffers" when God's plans will stand forever?