In the ancient time, the "nontransmittable to the third person" Dharmas were transmitted to those royals and the privileged, or on the top of a mountain, or in a deep forest, one-to-one only. Only those who have deep affinity and root capacity and those who are very interested in Dharma learning can climb mountains and cross rivers to look for it, to pursue it...
For those who come from the secular world, they need to abandon illusion in order to pick up some treasure. While keeping the illusion can only lead to picking up some sand, worthless. Guang Huan Mi Zong Dharma is priceless, invaluable.
Dharma cannot be bought with money...
In the Space Realm, all Buddhas' Achievement and all Bodhisattvas' Achievement have to go through the cultivation of Buddhas' Dharma, the cultivation of Esoteric Dharma. What is Esoteric Dharma? The essence of Dharma, i.e. the quintessence of the teachings...