妙法蓮華經玄義 7.191

7.191

發本顯迹，說佛壽長遠，觀佛三昧得大增長，從此亦有生身菩薩，得十妙中之五益，六即中之四益，損生增道（云云）。

Disclosing the original source to reveal the traces, expounding the Buddha's lifespan as vast and distant, the contemplation-of-the-buddha samādhi is greatly increased; from this, there are also bodhisattvas of the physical body who obtain the five benefits among the ten subtleties, and the four benefits among the six identities, diminishing rebirths and increasing the path (and so forth).