Light Side, Dark Side
God is unlimited and everywhere. There is nowhere that God is not. There is only God, non-dual. Take up mind and enjoy point-of-view, observer/observed, and duality. Then one starts thinking about good and bad, light and dark, right and wrong. Yet Reality simply is.

There are all kinds of mantras and spiritual practices based on the predominant guna. Sattvic sadhanas are there to get at your enlightenment, the best way to help the world. There are rajasic sadhanas to accomplish what you want in life: professional, material, family goals and such. There are tamasic sadhanas to control or pin down forces or others (careful, can and will likely bite you in the ass).
Tantra says no-fight. Love yourself as you are now. You can stop your becoming and be. If ego insists on becoming, you can choose a light side, a dark side or straight up the middle.
