The blessed man has the wisdom of God’s Word coursing through his spiritual roots, up to the branches and leaves, for the purpose of bearing fruit.

He is like a tree planted by streams of water that yields its fruit in its season, and its leaf does not wither. In all that he does, he...

God did count our sin, and he punished it in Christ. He did require righteousness, and he performed it in Christ. 

This psalm is not primarily about us, but we should remember that it was written for us.