User blog comment:Silver-Haired Seireitou/Sei-san's Classroom: Guide to Hakuda/@comment-24660252-20140619205300/@comment-2089817-20140619214201

Do you mean Jing? Yes, it is quite an interesting concept they discussed and actually is derived from real teachings. Jing (meaning "Essence") is often used in chinese medicine, but has been used to describe the different ways power can be expressed. That is what essence is. Such things as neijing, fajing, et cetera, all fall under that, which I shall indeed describe above.