坐禪三昧經 2.92

2.92

問曰：「我不言有常為實、無常為不實，我言有常、無常俱是不實。何以故？佛言：『空中有常、無常，二事不可得，若著此二事，是俱顛倒。』」

Question: "I do not say that permanence is real and impermanence is untrue; I say that both permanence and impermanence are untrue. Why is this? The Buddha said: 'Within emptiness, permanence and impermanence—neither of these two things can be apprehended; clinging to these two things is in both cases an inversion.'"