An Oko activity is an important function of HBS. "O" is an honorific. "Ko" means a prayer and lectures session. An "Oko" session is a gathering of members of HBS to pray and chant the Odaimoku and to listen to a sermon (Gohomon).
In Chapter 21 of the Lotus Sutra (Supernatural Powers of the Thathagata), Buddha stated that "For this reason, after the Thus Come One has entered extinction, you must single—mindedly accept, uphold, read, recite, explain, preach and transcribe it, and practice it as directed. In any of the various lands, wherever there are those who accept, uphold, read, recite, explain, preach, transcribe, or practice it as directed, or wherever the sutra scrolls are preserved, whether in a garden, a forest, beneath a tree, in monks quarters, in the lodgings of white—robed laymen, in palaces, or in mountain valleys or the wide wilderness, in all these places one should erect towers and offer alms. Why? Because you should understand that such spots are places of religious practice. In such places have the buddhas gained anuttara—samyak—sambodhi (enlightenment), in such places have the buddhas turned the wheel of the Law, in such places have the buddhas entered par nirvana."
Nissen Shonin, the founder of HBS, established the Oko system on the basis of Chapter 21 of the Lotus Sutra. The Oko system of HBS originated with the establishment of HBS. It has been held not only at temples but also at member's houses under the spirit of the Lotus Sutra. Oko is a practice uniquely characteristic of HBS which has continued for 150 years since Nissen Shonin founded HBS.
Oko is held at least once a month at various homes of members and are comprised of small groups who are divided into districts. An Oko is not only practiced at a temple but also at a member's home.
For a member of HBS, offering their home for Oko service is important. Occasionally, priests are invited and lay followers congregate to chant the Odaimoku together, listen to the Gohomon (Sermon) delivered by priests or lay priests, talk together about their sufferings, problems and make arrangements for future activities.
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