"Yuimagyo" says 'following that spirit being pure, hence the land of Buddha is pure', and "Shinjikan-gyo Sutra" also describes that 'Because the spirit is pure, the world becomes pure and because the spirit is impure, the world becomes impure.'
『維摩経』には「その心浄きに随って、すなわち仏土浄し」といい、また『心地観経』には「心清浄なるが故に世界清浄なり、心雑穢（ぞうえ）なるが故に世界雑穢なり」とある。