Nichiren said in "Kaimokusho" (Liberation from Blindness) that 'the doctrine of Ichinen sanzen sunk under the words of Hokekyo Honmon Juryo Hon, and even though Ryuju and Tenjin knew about it, they couldn't reach the doctrine, and only the men who earned enlightenment in my Tendai can get a hold of it.'
日蓮は『開目抄』で「一念三千の法門は但法華経の本門・寿量品の文の底にしづ（沈）めたり、竜樹・天親・知ってしかも・いまだ・ひろ（拾）い・いだ（出）さず但我が天台智者のみこれをいだ（懐）けり」と述べている。