大乘起信論義疏 2.15

2.15

問曰：所顯所表有何著別？答：言所顯者，此真理中隨修習緣有可顯義，轉理成行，以緣照解斷惑所顯，故名所顯。所言表者，真如理體平等一味，絕言離相。然理不自顯，寄法以表，故名所表。

Question: What is the distinction between 'what is revealed' and 'what is indicated'? Answer: As for 'what is revealed', in this true principle, in accordance with the conditions of practice and cultivation, there is that which can be revealed; converting principle into practice, it is revealed through condition-illumining understanding and the severing of delusion—hence it is called 'what is revealed'. As for 'what is indicated', the principle-essence of tathatā is equal and of one flavor, beyond speech and free from marks. However, principle does not reveal itself; it is indicated by relying upon phenomena—hence it is called 'what is indicated'.