We have not because we ask not

Ps 143 3 "The enemy pursues me, he crushes me to the ground; he makes me dwell in darkness like those long dead.

4 So my spirit grows faint within me; my heart within me is dismayed."

This Psalm is teaching if all men were able to act according to Gods standard of creation then there would be no opposition. Each man would achieve Gods design in the perfect holistic experience that would create the ultimate unity and satisfaction. But all men are crooked and self serving.  The Psalms create the reality of the kingdom in turning mans system upside down. Now listen unless the communication rises up to the level of Gods kingdom rule then its an expression of religious hatred. 

You see this here in the plea. He faces the system of man that has overturned Gods word from the beginning of time. God has established His word that cannot be thwarted. The law speaks death to violators. The curse of the law works to destroy the way of law breakers. The communication of this system affects his spiritual vitality. No matter what kind of evil it is, corruption, miss guided religious zeal, depravity at its worse or speaking threatening words, it all deserves the response of the curse. Because the Psalmist is concerned about the spiritual effects and not the actual crime itself. 

 5" I remember the days of long ago; I meditate on all your works and consider what your hands have done."

How does he use his memories of the high points of his life? He concedes to Gods control and creation of his future success. "I remember" is really a wish for God to remember through redemption. Its the same thing as getting a promise from God that has been established in the past and using that promise in his argument to establish future success. But in the christian context the next success is much better than the last one. 

Whatever the opposition..personal sin, guilt, fear, shame and sorrow are motivations to transfer personal anger into Gods universal response to opposition through the curse.11" For your name's sake, O LORD, preserve my life; in your righteousness, bring me out of trouble. 12 In your unfailing love, silence my enemies; destroy all my foes, for I am your servant." For the christian this exposure to the depravity of the system of man the voice of the evil curse. Israel had opposition because there were nations occupied by evil men. God commanded Israel to destroy all the evil nations around them. I do not believe that Israel practiced speaking these laws ,promises, decrees etc and so they never advanced to seeing their enemies annihilated through the ordained agencies. Their passion never rose up to Gods curse. There was never a national will expressed. But in our little world we can create success over time.