3Know that the LORD has set apart the godly for himself;
the LORD will hear when I call to him.
The Psalmist begins by separating himself from the wicked in the nations. You see when we are saved we are separated from the world unto God. We think this in our sinful state that God is trying to change us to something we wont like. But the Psalmist is starting his petition by this point. If God has separated me then He will listen  to me. We may think that God has separated us in order for us to stand and worship Him in the heavens. But God has separated us unto Himself so that we will rule over the nations and rule in the new world. If God did not separate us He could not return us to our original purpose in ruling over the world. God separated us unto Himself for us not for Himself. This is why  the Psalmist uses this to encourage himself that God is listening.In other words in order for God to return us to our purpose He had to send His Son to become sin and the curse for us. So now God becomes our Father and Judge since we approach Him by identifying with the Son. The Father sees us in the Son. In your anger do not sin; when you are on your beds, search your hearts and be silent. Selah Offer right sacrifices and trust in the LORD .

So the Psalmist is saying that God separated us and gave us  the axioms so that we would be successful in ruling the world.  How can God hear us? The Psalmist uses the promises of God in the covenant. He knows that God has covenanted with His people and will listen to their cries. The Psalmist is angry that the wicked are opposing the Gods righteous nation. He teaches us how to come to God with righteous anger and not offend. He is saying that the anger of God is put on the animal. God curses the animal by tearing it apart. In 50 God warns that if the sacrifice is not offered in the spirit of the law, covenants, curses, statutes, promises and decrees that  God would tear the Psalmist apart instead of the animal.Offer right sacrifices and confide in the Lord or speak the axioms to God as and exercise of our faith. When we confide in God the word is searching our hearts. We are being changed and molded by the axioms. God searches us like a doctor searches to see if there is a disease. God is the only one who knows us more than we know ourselves. He sees everything. God created us to live in unity of body and spirit. God must repair the defects and reorder our lives in order to restore the unity.