“The rains did not extinguish the wood-fire burning upon the altar’s woodpile.”
Miracle or no miracle? Water and fire are “opposites” in that they do not naturally share the same space. This is why the plague of hail, inflicted on Pharaoh and the Egyptians for refusing to release the Children of Israel from slavery, was miraculous (the Torah describes the hail as descending together with fire: Exodus 9:23-24).
But is this truly a miracle? Readers may have personal experiences of their own regarding bonfires and camp fires that have continued to burn notwithstanding the rain. They are not alone. The same phenomenon has been noted on a far larger scale too (see Jake Spring, “Rain will not extinguish Amazon fires for weeks, weather experts say,” Reuters, 27 August 2019, here).
Only if there is sustained and heavy rain will a well-established fire be at risk of being extinguished. The fire on the altar’s woodpile, being carefully prepared and dutifully tended, should therefore stand a good chance of surviving any given downpour. Be that as it may, the persistent survival of this fire in the two Temples for an aggregate of nearly a thousand years does rather suggest something more than chance or coincidence: this mishnah therefore attributes it to divine intervention.
There is surely a bigger message in this mishnah, and I would suggest that it is this.
The symbolism of fire and water in this miracle cannot be ignored. Some commentators have taken the Temple to be a metaphor for man, or even as an allegory of man’s relationship with God. Fire represents flaming desire, a passion in man’s heart: where those flames are kindled on the altar of man’s service to God, they cannot be extinguished.
A second explanation is founded on the symbolism of the word used here for wood, עץ (etz, “wood” or "tree"), together with that of גשמים (geshamim, “rains”). The etz here is an allusion to Torah, described as “a tree of life to those who grasp it,” (Proverbs 3:17) and the גשמים here allude to גשמיות (gashmi’ut, “materialism,” “non-spiritual matters”). Employing this symbolism, the dedicated student who lays himself out, as it were, on the altar of Torah will be ablaze with the fire of Torah, a fire that the waters of materialism and the pleasures of the physical world cannot extinguish.
This imagery is both powerful and attractive. However, even though it is accepted that learning Torah is something that requires divine assistance as well as human effort, some may be a little sad to think that, if a serious Torah student pursues his studies so enthusiastically that he cannot be derailed by the distractions of gashmi’ut, we should have to regard that as a miracle.
