首楞嚴義疏注經 8.211

8.211

佛覺，果智也，如前文云「本覺湛然，覺齊佛覺，精真發明，地如佛地。」此即用佛果智為己因心也。然猶未能離因顯果，故云若出未出。近於登地，將發此智，故云若出。猶拘因相，尚未能離，故云未出。喻如鑽火，熱相先現，火出不久。火喻佛覺，鑽喻加行，木喻因相。火出則木盡，覺現則因亡，亡因在即，故喻如煖，此約發智以顯也。

"Buddha's awakening" is the fruition-wisdom. As the preceding text says: "Original awakening is tranquil and pure; awakening equals the Buddha's awakening; the pure and true becomes luminous, and the ground is like the ground of the Buddhas." This is precisely taking the Buddha's fruition-wisdom as one's own causal mind. Yet one has not yet been able to leave the cause to manifest the fruit; hence it says "as if about to emerge yet not emerged." Being close to ascending the grounds, about to bring forth this wisdom, it says "as if about to emerge." Still restricted by causal characteristics and not yet able to leave them, it says "not emerged." It is compared to drilling for fire: the sign of heat appears first, and the fire will emerge before long. Fire represents the Buddha's awakening; drilling represents intensified practice; wood represents causal characteristics. When fire emerges, wood is consumed; when awakening manifests, the cause is extinguished. Extinction of the cause is imminent, hence it is compared to heat; this is revealed in terms of bringing forth wisdom.