首楞嚴義疏注經 4.79

4.79

前二句指前二性，為生火之由。於內則生滅不停、堅執不捨，於外則動搖不息、堅剛難壞，互相摩觸而有火生，如取火法鑽燧與木，一堅一動。火能鎔散，成熟萬物，故云為變化性。

The first two lines point to the preceding two natures as the cause of generating fire. Internally, arising and ceasing do not cease, and solid clinging is not abandoned; externally, motion does not rest, and rigid hardness is difficult to destroy; mutually rubbing against each other, fire is produced—just as in the method of producing fire with a drill and wood, where one is solid and the other in motion. Fire can melt and disperse, bringing all things to maturity; hence it is said to be "the nature of transformation."