The fear of God as it relates to the curse.

 Ps 40

14 May all who seek to take my life be put to shame and confusion; may all who desire my ruin be turned back in disgrace.

15 May those who say to me, "Aha! Aha!" be appalled at their own shame.

16 But may all who seek you rejoice and be glad in you; may those who love your salvation always say, "The LORD be exalted!" 
Ps 35 27 May those who delight in my vindication shout for joy and gladness; may they always say, "The LORD be exalted, who delights in the well-being of his servant."

I do not believe that people can express love in an orthodox way until they understand how the fear of God and salvation relate to the use of the curses and blessings. I believe that the expression of anger as a weapon is a miss use of our freedom. But at the same time I do not believe that a person can control their anger or express love from the proper motive without being converted in understanding the voice of death as it is described in the curses. To put anger to death is to see be seasoned in hearing the voice of the law as a voice of death. The only death that we gain by experience is to hear this voice clearly. If there is any presence of self left to protect then we are powerless to react in a mature way. When I speak of self ..I mean ...that we experience our value as if the law was our set of principles that we get value from. 

This is exactly what the Psalmist is describing here. There is a clear line that cannot be crossed. If we believe that all that we have is a gift of God then we will only wish that others get these gifts. The only way that we can come to this conviction is to see that everything that we have and others have has nothing to do with us. To exalt God is to curse the opposition that brings shame because Gods universe of gifts is the expression of freedom by the limits we place on the wrong view of self in which we place value on the law, the person who receives the gift and our part in the gift. If the only value of the gift is what God has done then there is no reason for blame. This is the boundaries that describe what prevents us from being saved. Its cursing others by seeing these things as personal gain and having an addition and subtraction that brings in blame or praise worthiness.