Here is a great quantum video
What does it have to do with spirituality? A lot. But one must go beyond the preliminary understanding of all that is written!
Once a disciple has experience of Kapil Sankhya Shasta and Gita, then one must understand Devatma Shakti by Vishnu Tirthji Maharaj, then understand saundarya Lahiri by Vishnu tirthji Maharaj
After that, the other great books such as spanda Karika, paratrisikha vivarna, Tantra Sara must be grasped
I should compliment Lakshman Joo, Vijay Singh, Ortega Muller for translating the great works into English and H N Charavarty, Boris Marjonovich
Although there are some errors in those books a brahma gyani immediately spots and corrects it
These books are written for those who already have experienced the highest multiple times and reading them without experience is a burden
Bhavin