肇論新疏 2.408

2.408

玄機者，真智也。初句令捨情執封滯，無懷前識以標玄存所存之必當。事外者，令無即言定旨、尋大方而徵隅。齊萬下，謂觀緣萬殊、性空齊一，非有也；至虛只在緣中，非無也。當言下，承前以明不取。夫能如是忘情了境，始可與言心也。已推移者，瑤師云：「進退也。權多方，推移何定？以萬有故撫化，由一虛故無為。」

"Mysterious inner workings" refers to true wisdom. The first clause enjoins relinquishing emotional attachments and bounded stagnations, not harboring preconceived notions so as to mark out the mystery, holding that what is upheld will certainly hit the mark. "Outside affairs" enjoins not determining the purport directly upon words, and seeking the great square rather than searching its corners. From "leveling myriad existences" downward, it means that contemplating conditions with their myriad differences, and prakṛti-śūnyatā being level and one, is non-existence; the utmost void is merely within conditions, which is non-non-existence. From "one should say" downward, it continues the preceding to elucidate non-grasping. Indeed, only when one can thus forget feelings and clarify objects may one begin to speak of the mind. As for "moving forward and backward," Master Yao says: "It means advancing and withdrawing. Upāya has many directions; how could moving forward and backward be fixed? Because of myriad existences, one adapts to transformation; due to the one voidness, one is unconditioned."