The wicked are not so,The opening half of Psalm 1 speaks directly of the blessed man, but the closing half speaks directly of the wicked man. After stating several qualities and descriptions of the blessed man, the Psalm switches subject and states: The wicked are not so.
But they are like chaff which the wind drives away. (Psalm 1:4)
The righteous are like trees planted by streams of water, but the wicked are deserving of no such comparison. Instead, they are like the chaff which the wind drives away. In farming, chaff is worthless, only the wheat is wanted. At first glance, chaff and wheat appear identical — which makes them difficult to separate. One way to separate chaff and wheat is to toss both of them straight up into the air. The chaff, because it is lighter, will be driven away by the wind, but the wheat, which is heavier, will fall safely to the ground.
The wicked are compared to that image: chaff which the wind drives away. Just as the chaff is unwanted and unneeded, so the wicked are insignificant and worthy of nothing in the eyes of God. The hypocrite, who on the outside appears righteous, will be found weightless. When judged by God, the hypocrite will be driven out like chaff in the wind.
Traverse Not With Wickedness - Psalm 1:1
Delight In The Lord's Instruction - Psalm 1:2
The Prosperous Tree - Psalm 1:3
Temporal Foundations - Psalm 1:5
Flawless Discernment - Psalm 1:6