首楞嚴義疏注經 2.199

2.199

物類雖殊，見性常一，不隨境異，即是汝真，此顯真見平等無差。汝前問云：「云何得知是我真性？」今明境自差別，見性無殊，由是得知是汝真性。

Although the kinds of objects are different, the nature of seeing is constantly one; not following differences in the objective realm, it is precisely your reality. This reveals that the true seeing is equal and without distinction. You asked earlier: 'How can I know it is my true nature?' Now it is clarified that the objective realms are themselves distinct, while the nature of seeing is without difference; it is by this that you can know it is your true nature.