“The Lord will not allow the righteous soul to famish,
but he casts away the desire of the wicked.”
Proverbs 10:3

…he casts away the desire of the wicked.

There is no gain in wickedness because in their striving, the wicked are striving against God and cannot prevail. Whatever is their motive, their goal, they will not find happiness because the Lord casts away the desire of the wicked. They will seem to prosper, but in the end they will fail, having never achieved the happiness they thought riches or glory would bring them.

For believers on the other hand, God will grant them the desires of their heart if they will remain patiently trusting in his faithfulness.

“Do not fret because of evildoers,
nor be envious of the workers of iniquity,
for they shall soon be cut down like the grass,
and wither as the green herb.
Trust in the Lord, and do good;
so shall you dwell in the land,
and truly you shall be fed.
Delight yourself also in the Lord,
and he shall give you the desires of your heart.”
Psalm 37:1-4

Though the wicked acquires all that he wants, he has no peace. His mind is always on his riches, how to preserve them and how to add to them. It’s an obsession, his whole life is spent obsessing over his wealth or position.

On the other hand, one who delights in the Lord is one over whom the Lord delights. The one who delights himself in the Lord and waits patienly for him, this is the one who will receive from the Lord the desires of his heart. I would rather have the delight of the Lord than all the riches in the world, because all that is good, all that is joy, all that is true happiness, is found only in him.