First of all thank you for your answer, Jikan, and sorry, that I didn't reply earlier. Is it still practised, that Tendai monks meet with lay practitioners twice a year for a night long ceremony to recite the nenbutsu? Genshin established this practice groups (called Kangaku-e 觀學会) to establish a karmic bond between a monk and laypeople and to accumulate merit for birth in the Pure Land. I read, that it was disbanded in this form, but maybe a similar ceremony is still held today.
I'm not familiar with this, but that may reflect my own ignorance.
An I think, that there is also one major difference between a Jodo approach to the nenbutsu and a Tendai approach (but which is also more doctrinal than practical): In the Jodo tradition you don't recite the nenbutsu to accumulate merit, whereas in Tendai accumulating merit is also important (which includes doing good deeds)...
Again, this is one I'm ignorant of. I should say: I haven't been instructed in this point of doctrine, and I haven't read about it. The accumulation of merit wasn't mentioned when I was taught the practice of nembutsu, for what that's worth. Instead, it was taught in the context of hongaku (inherent enlightenment): we have in ourselves all of Amida's qualities in a latent form; the purpose of nembutsu is ultimately to draw out or manifest those enlightened qualities. I don't think this is how nembutsu is presented in any Jodo school.
I hope that helps.
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