Psalm 64 only has ten verses. The first six describe how the wicked and evil conspire and plot. They say that they have devised the perfect plan. David explains "Surely the human mind and heart are cunning."
But no matter how clever and how cruel man is, and how they fearlessly ambush others, they are no match for God.
God will shoot them with his arrows and they will suddenly be brought down. god will use the wicked's own words against them and bring them to ruin.
The end result is that people will see what happened to the wicked and what God did to bring them down. People will fear God and will proclaim His works and ponder what He has done. The righteous will rejoice in the LORD, take refuge in Him and glory in Him.
So what does this mean to us in 2017?
It doesn't take much looking around to see a lot of evil wicked men devising all kinds of evil things against others. It's easy for righteous people to get discouraged seeing how clever and skillful they are at attacking the innocent.
So if you find yourself feeling overwhelmed by the wickedness of the world, take courage. With just a few shots of His arrows God will bring them down to ruin. He will even use their own words against them.
Don't be in despair looking at all of the evil in the world, the wicked plotting, etc.
Take notice of what God is doing.
Ponder, think about, what He has done.
Rejoice in the LORD.
Take refuge in Him.
Glory in Him.