Go along with it.
A few excerpts from the dialogue:
Sometimes that's not a bad thing either.
What we call a mental disorder is sometimes not necessarily a disease,
it may also be a way of dealing in a desperate situation, and the patient is looking for a way out.
When will it end?
When he no longer needs to deal with it.
Thinking of Lars' shy smile, the enthusiasm and sincerity in the eyes of his brother, sister-in-law, villagers, doctors, all of them took his delusions for granted and as they were. Of course, there is also the girl who finally held hands with lars to harvest love, a little silly and naive and persistent.
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