n♾[ Do not pronounce the final [u], please; it is devoiced. — This piece requires only casual knowledge of the work of 恵心僧都. In my opinion and experience, a reading of 往生要集 is not required to understand both a practice and some derivative, consequent, iterative effects (which one might summarize as incidental, but which I, myself, do not experience as “incidental”) of a practice of Nembutsu for oneself.