The Almighty Buddha Great Sun, or Mahavairocana Buddha preached Secret Buddhism. Samantabhadra Bodhisattva who was the former attendant of Sakyamuni Buddha became Vajrapani Bodhisattva, attendant of Vairocana Buddha.

Tathagatha Mahavairocana resides in the heaven of Mahesvara (or Mahamahesvara) in the palace of the Diamond Dharma realm. He preached the secret teachings to Vajrapani Bodhisattva and other Bodhisattvas from the ten directions through his Incarnate Body Sakyamuni Buddha on the seventh day of his enlightenment. This could be called the original creation of the True Words sect.

Vajrapani Bodhisattva received the ceremony of Abhisekha to inherit the precious Dharma of Vairocana Buddha. His mission was to impart the teachings to the world. He had written The Mahavairocana Sutra and the Vajrasekhara Sutra. Each has about ten thousand invocations, and he created the Garbhadhatu Mandala and the Vajradhatu Mandala:

The Garbhadhatu Mandala: This type of Mandala is a picture symbolizing the universe and Garbhadatu Mandala means the Womb Realm. According to Mahavairocana Sutra:

“Garbhadhatu describes the fetus and its soul coming from the predestined union of the parents. It grows from the wind of Karma and a child is born completed with bones, tendons and inner organs, bearing his parent’s ethnicity. In the same way, as the practitioner learns the virtues of compassion taught by the True Word sect, he will slowly develop peace and compassion in his heart which results in beneficial actions for humanity and joy to the Dharma Realm. When his merits are complete, he can reach superior wisdom and get accepted into the lineage of the Buddhas. It is by imitating the Buddha’s holy fetus of love and wisdom that one can reach the realization of the Three Secrets, or Enlightenment”.

The Vajradhatu Mandala: According to Vajrasekhara Sutra, this Mandala represents the unchanging nature of the absolute truth, which is compared to the “sturdiness” and “sharpness” qualities of the diamond that cannot be destroyed although it can destroy all. The sturdiness of the absolute Truth prevents it from being destroyed, and the sharpness of Buddha’s Wisdom destroys all obstacles to reveal the ultimate Truth. The diamond is also the most precious material among others and the most invincible among all weapons. It represents the unbreakable and eternal Body of Law, which has no death, no past life, and no after life. The same diamond-like quality of the absolute truth represents the real nature of the “Middle Path” that is paved with numerous merits.

This invincible weapon, among others represents the invincible logic of the Emptiness doctrine that stands against all afflictions. Human beings, celestial beings or the Buddhas, cannot create such a doctrine.

Vajrapani Bodhisattva put these two major Sutras in the Iron Tower of the South Heaven, where they remained for centuries until Nagarjuna opened the tower. The legend said that Nagarjuna, by the power of Adhistana saw Vajrapani transmit the teachings and entrusted the two Sutras to him.

Nagarjuna Bodhisattva (150-250 AD) came from southern India. He was the founder of eight Mahayana sects. Being exceptionally bright, he mastered all contemporary religious philosophies. His viewpoint was so solid that no one from the The Great Vehicle School (Mahayana) after him could surpass his explanation of the basic philosophy of the Buddha’s teachings.

Secret Buddhism and other Mahayana sects have laid their foundation on his principle of Emptiness (Madhyamika-Castra). He was held in such veneration that he was regarded as the incarnation of Amitabha Buddha.

Nagarjuna transmitted the Dharma to Nagabodhi, who was an adept monk at Nalanda University. Nalanda University was the largest and first Buddhist monastery in India, from which came many proficient Buddhist teachers of the Mahayana sects as well as from other countries. Many founders of the doctrine who succeeded each other in preaching the doctrine, such as Asangha and Vasubandhu, had taught at this university. When Nagabodhi was over one hundred years old, Hieun-Tsang of China came over in the year 633 AD to receive the Dharma from him.

After receiving the Dharma from Nagarjuna, Nagabodhi transmitted the teachings and preached in the southern region of India and Ceylon. Nagabodhi was over 700 years old.

Secret Buddhism spread northward to Tibet, China and Japan, and southward to Ceylon, Burma, Indonesia, Cambodia and Laos to became the two main North and South Secret branches.