法華義疏 12.81

12.81

或謂火少故不能燒，或謂禁呪力故令小火不燒，今入大火不燒則知是菩薩力。

Someone might think that because the fire was small it could not burn, or think that due to the power of incantations and spells a small fire did not burn; now, entering a great fire without being burned, one knows it is the power of the bodhisattva.