3. When—Supply from Isa 64:2, "As when."
terrible things—(Ps 65:5).
we looked not for—far exceeding the expectation of any of our nation; unparalleled before (Ex 34:10; Ps 68:8).
camest down—on Mount Sinai.
mountains flowed—Repeated from Isa 64:1; they pray God to do the very same things for Israel now as in former ages. Gesenius, instead of "flowed" here, and "flow" in Isa 64:1, translates from a different Hebrew root, "quake … quaked"; but "fire" melts and causes to flow, rather than to quake (Isa 64:2).