Hi all,   Recently I saw this video of Nathan Brine https://www.youtube.com/watch?v=hi16r-tST98 about using the Celestial Eye in Taoist alchemy. That explanation sounded A LOT like Dzogchen's thogal. Slightly different narrative but seeing the lights and light visions are quite the same.   It was amazing to see this similarity is different traditions. Does anyone knows something about this? Are there any more Taoist sects next to Longmen sect that have this kind of practice?   Longmen sect is part of Quanzhen sect, which incorporated both Buddhist, Confucian and Taoist practices. Can one tell if celestial eye/thogal is historically Taoist practice borrowed by Bon/Buddhists or Bon/Buddhist practice borrowed by Taoists?   edit: maybe even both Taoist and Dzogchen came to same practice empirically. Who knows....