維摩經玄疏 5.85

5.85

Answer: If it is the principle of the conventional truth, it is the conceivable principle; if it is the principle of the Middle Way buddha-nature, it is the inconceivable principle. Therefore, this sūtra says: 'Like my illness, which is neither real nor false; the illness of sentient beings is also neither real nor false.' Hence know that the principle of the Middle Way is different from the absolute truth. That the absolute truth is called the conceivable principle is because it is not the tathāgatagarbha; that the principle of the Middle Way is called the inconceivable is because it is precisely the tathāgatagarbha. It is called a 'storehouse' precisely because nothing is accumulated; therefore it is called the inconceivable principle.