Well I personally found what I was looking for in regard of dualism and whether or not it's usefull or not. I can't believe the answer is so simple and it hit me...Literally when The Middle Pillar written by Regardie fell out my bookcase when I walked by (IMG:
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I still stand by my views on the dichotomy of good vs evil, but the other dualities...
The Tree of Life in the mystical kaballah system is divided in 3 parts. The left "pillar", the "right" pillar and the one in the centre. Each containing respectively 3-4-3 Sephiroth/Qlipoth. The 2 pillars symbolize dualities while the centre one is about being in balance. In Regardie's book he states the psychological effects of going to one of both dualities and sees them as extremes of life. Extremes are never healthy, but finding the balance in which you pass no judgement on both dualities and are not tempted to follow the "extremes" in life is the way to go. Simply put...being in perfect balance.