Dōgen referred to them as kosoku (ancestral criteria) or innen (circumstances and causes or results, of a story). The word kōan for Dogen meant "absolute reality" or the "universal Dharma". Collections of dharma discourses Lectures that Dōgen gave to his monks at his monastery, Eihei-ji, were compiled under the title Eihei Kōroku, also known as Dōgen Oshō Kōroku (The Extensive Record of Teacher Dōgen's Sayings) in ten volumes. The sermons, lectures, sayings and poetry were compiled shortly after Dōgen's death by his main disciples, Koun Ejō (孤雲懐奘, 1198–1280), Senne, and Gien. There are three different editions of this text: the Rinnō-ji text from 1598, a popular version printed in 1672, and a version discovered at Eihei-ji in 1937, which, although undated, is believed to be the oldest extant version. Another collection of his talks is the Shōbōgenzō Zuimonki (Gleanings from Master Dōgen's Sayings) in six volumes. These are talks that Dōgen gave to his leading disciple, Ejō, who became Dōgen's disciple in 1234. The talks were recorded and edited by Ejō. Other writings Other notable writings of Dōgen are: Fukanzazengi (普勧坐禅儀, General Advice on the Principles of Zazen), one volume; probably written immediately after Dōgen's return from China in 1227. Bendōwa (弁道話, "On the Endeavor of the Way"), written in 1231. This represents one of Dōgen's earliest writings and asserts the superiority of the practice of shikantaza through a series of questions and answers. Eihei shoso gakudō-yōjinshū (Advice on Studying the Way), one volume; probably written in 1234. Tenzo kyōkun (Instructions to the Chief Cook), one volume; written in 1237. Bendōhō (Rules for the Practice of the Way), one volume; written between 1244 and 1246. The earliest work by Dōgen is the Hōkojōki (Memoirs of the Hōkyō Period). This one volume work is a collection of questions and answers between Dōgen and his Chinese teacher, Tiāntóng Rújìng (天童如淨; Japanese: Tendō Nyojō, 1162–1228). The work was discovered among Dōgen's papers by Ejō in 1253, just three months after Dōgen's death. Lineage Though Dogen emphasised the importance of the correct transmission of the Buddha dharma, as guaranteed by the line of transmission from Shakyamuni, his own transmission became problematic in the third generation. In 1267 Ejō retired as Abbot of Eihei-ji, giving way to Gikai, who was already favored by Dōgen. Gikai introduced esoteric elements into the practice. Opposition arose, and in 1272 Ejō resumed the position of abbot. Following Ejō's death