This morning, I was listening to a talk from Bhante Sujato from 2013 on the dhammanet podcast:
Thought: Past, Present, Future and the Camel: http://feedproxy.google.com/~r/dhammanet-podcast/~3/iXBobg2mASc/thought-past-present-future-and-camel
It’s a very helpful talk. In it, he mentioned a sutta that described a monk (Sanikavasin?) and a shopkeeper (Upagupta? who wanted to go forth) around the 24:22->26:30 minute mark of the talk. The monk describes a useful approach to manage wholesome and unwholesome thoughts which involves using black and white stones. I thought it was a lovely sutta and tried to look it up, but couldn’t find it. I also checked on Suttacentral. I am writing today to ask if you could help me identify the correct spelling of the names, or the sutta number, so that I could read the original.