The Psalmist is carefully teaching we can properly approach God when we are furious. The key question is it good for Gods saints to enthusiastically adopt a general attitude of justified anger as a direct result of being mistreated in the violent world? Should we be overwhelmingly concerned for examining our sin or justly appreciate the importance of adequately dealing with our understandable anger on a daily basis? 

We approach God with the divine law, covenants, curses, etc. on our lips. Offer right sacrifices and trust in the Lord. Here trusting is "confiding in" so as to be secure. Gods word constitutes the reliable basis of our mutual trust as we mockingly speak the gifts. When the Psalmist offers a sacrifice, he is approaching God graciously according to his present disposition. The Psalmist is cursing with a overflowing joy. He enlarges the view of God by a covenant confession. He is in danger, containing the wicked curse by God forcibly returning the terrible evil on the political schemer. This is a picture of penal substitution by glorious death. It pleased God to justly punish Christ who quelled all corrupt opposition. The substitutionary work of Christ by which we role all our troubles both inward and outward over to God.