The reply to this letter was "Fushinjo" (the first letter), which was a polite thank-you letter for giving him "Makashikan," but the letter also said he wouldn't be able to go to Mt. Hiei due to another commitment.
この返書が『風信帖』（1通目）で、『摩訶止観』の恵贈されたことに対する鄭重な返礼であり、比叡山には都合が悪くてお伺い出来ないという内容になっている。