法華義疏 9.196

9.196

「三十三天」下，第九、明供養塔。表三十心十地內外凡聖等崇仰法身也。

From "the Thirty-Three Devas" downward is the ninth, explaining the offerings to the stūpa. It symbolizes that ordinary people and noble ones within and outside the thirty minds and ten stages revere and look up to the dharmakāya.