It was also during this period of intense mantra practice that Kūkai dreamt of a man telling him to seek out the "Mahavairocana Tantra" for the doctrine that he sought. The "Mahavairocana Tantra" had only recently been made available in Japan. He was able to obtain a copy in Chinese but large portions were in Sanskrit in the Siddhaṃ script, which he did not know, and even the Chinese portions were too arcane for him to understand. He believed that this teaching was a door to the truth he sought, but he was unable to fully comprehend it and no one in Japan could help him. Thus, Kūkai resolved to travel to China to spend the time necessary to fully understand the "Mahavairocana Tantra".