成唯識論演祕 5.199

5.199

答：慚既稱善，何得非淨，然不似彼，淨為其相，與信不同。由斯難、答，望義不同，故無有失。

Answer: Since shame is designated wholesome, how could it not be pure? Yet unlike faith, purity is not its characteristic, so it differs from faith. Therefore, the challenge and response consider different meanings, and thus there is no error.