The greatest learning from Duality? For me, it's acceptance. It seems so obvious but is also so hard in practice. After taking Duality, I have learned to...
1. Accept that energy clearing is not do-once-and-be-done-forever. I need to keep working on it. The good news is I have the power to clear my own energy.
2. Accept that it takes time and practice to get better. Just because I'm not seeing "perfect" results yet doesn't mean my meditations are not working. Be patient and be happy when the success rate improves.
3. Accept that the journey inward is not always easy, but that's ok. Sometimes it's painful when I'm going through a growth period, and sometimes it hurts when negative energy is escaping from my body. Know these are actually good signs and once they pass I'll feel better.
Oh, and I also learned to stay amused and be gentle with myself.