淨影寺慧遠 清化寺時代 護法菩薩 地論學 攝論學 地持論義記 十地經論 顯實宗 Jing-ying Huiyuan The period at Qinghua Monstery Bodhisattva defending buddhism Di-lun school She-lun school The Commentary on Bodhisattva-bhumi The Commentary on Dasa-bhumika-sutra-sastra The Commentary on Mahayana-sraddhotpada Xian-shi school