I'd say it depends on many factors. If you immediately go out and get hammered and get very little sleep for a few days in a row, the changes will probably vanish much more quickly than if you being regularly applying some of the discipline you learned.
You can take a cold shower, or you can ride the momentum that the retreat gave you and keep the shower lukewarm. Sometimes it even gets hot and really nice feeling and you don't want to get out, but then after that kind of shower, even drying off feels good.
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And going back into the world analogous to having a cold shower. How much is undone?
I'd say it depends on many factors. If you immediately go out and get hammered and get very little sleep for a few days in a row, the changes will probably vanish much more quickly than if you being regularly applying some of the discipline you learned.
You can take a cold shower, or you can ride the momentum that the retreat gave you and keep the shower lukewarm. Sometimes it even gets hot and really nice feeling and you don't want to get out, but then after that kind of shower, even drying off feels good.