Dual/non-dual approaches are like the dual ‘wave/particle’ nature of light.
Depending on the observer’s disposition, spiritual practice, the shaping of the teaching, will take on a dual or non-dual form in the eyes of the practitioner.
Thus, someone who only teaches spirituality in a dual form would be as incomplete in his understanding as a scientist affirming that light only exists in the form of particles.
Notes & Silence 
Sooo…
It is as you see it now, but will be as you see it tomorrow, but only for you?
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