宋高僧傳 23.33

23.33

系曰：言遺身者必委棄全軀，如薩埵王子是歟。今以指為燈，以肱擎炷，何預斯例，莫過幸否？通曰：「煉指斷肱，是遺身之加行也。況復像末，尤成難事。其猶守少分之廉，隅入循吏傳同也。」

The appraisal says: Those who speak of renouncing the body mean that one must discard the whole body, as did Prince Sattva. Now, taking a finger as a lamp or bearing a torch upon an arm—how can this belong to such a category? Is it not an exaggeration? In general, it is said: 'Burning a finger or severing an arm is the preparatory practice (prayoga) for renouncing the body. Moreover, in the semblance and final ages, it is an especially difficult undertaking. It is just like maintaining a partial degree of integrity and being placed alongside upright officials in their biographies.'