法苑珠林 23.8

23.8

又迦延論云。何名無慚。答曰。可慚不慚。可避不避。不善恭敬。不善往來。此謂無慚。云何名無愧。可羞不羞。可畏不畏。惡事不畏。故稱無愧。又不善往來名無慚。惡事不見畏稱無愧。翻此前名。故云慚愧。

Furthermore, Kātyāyana's treatise says: "What is meant by shamelessness (āhrīkya)? The answer is: not feeling shame when one should feel shame, not avoiding what one should avoid, not being properly respectful, and not having proper associations. This is called shamelessness. What is meant by lack of remorse (anapatrāpya)? Not feeling disgraced when one should feel disgraced, not having fear when one should have fear; not fearing evil deeds is therefore called lack of remorse. Furthermore, improper association is called shamelessness, and seeing no fear in evil deeds is called lack of remorse. Reversing the above definitions is what is meant by shame and remorse."