大乘起信論義記 2.71

2.71

From 'if free from' onwards is the reverse conclusion: because it is in antithesis to the absence of defilements that the real is spoken of as empty, not that the absence of the essence of tathatā is taken to be empty. Alternatively, this passage resolves doubt: upon hearing of true emptiness above, a doubter would suppose that the true essence and the virtues numerous as the sands of the Ganges are negated. Now it is explained, as can be understood from the text, which clarifies that emptiness is not different from non-emptiness.