You're interested in Vihara activities, aren't you?
I guessed right away, and you said, “Was that what happened! Convinced!!” I would like to express it in a way that makes me think, but I would like to be able to tell you that it is rather difficult, and that there is also danger in it.
In the first place, in Buddhism, there is a principle that “truth cannot be expressed in words,” and “words cannot be trusted.” The word is “fiction,” isn't it?
Words cannot make a perfect perfect match between “name” and “object.”
When it comes to what the word “desk” indicates, there are no elements common to all desks in the world. Knees also become “desks,” and chairs also become “desks.”
Furthermore, there are people who see the “word 30,000 yen” and think it's expensive, and there are also people who think it's cheap. There are people who have a positive image when they see the “word clear blue sky,” and there may also be people who have a negative image.
In other words, words are “imperfect,” and even the content that the recipient captures that imperfect thing is “varied.”
This is because, based on such an assumption, when you ask to express “what is a vihara activity” in one word, if the standard is “whether or not you are satisfied” rather than “whether or not you are satisfied,” then there is a possibility that you will use that “own satisfaction” to cut off “what is your satisfaction with Vihara activities expressed in other words.”
Therefore, I recommend that you check for yourself as you learn and practice “what are vihara activities.” Everyone dies, so it's probably “my problem.”
Finally, even if I say that, here's a reference link...
Philosophy of Jodo Shinshu Honganji School Vihara Activities
http://social.hongwanji.or.jp/html/c11p3.html
Vihara (Wikipedia)
https://ja.wikipedia.org/wiki/ビハーラ
Vihara activities as a path beyond life and death
http://manazasi-letter.com/index.php?%C0%B8%BB%E0%A4%F2%C4%B6%A4%A8%A4%EB%C6%BB%A4%C8%A4%B7%A4%C6%A4%CE%A5%D3%A5%CF%A1%BC%A5%E9%B3%E8%C6%B0