R. Shimon b. Gamliel says: Come and see how different are the ways of the Holy One Blessed be He from the ways of flesh and blood. (A man of) flesh and blood heals bitter with sweet, but the Holy One Blessed be He heals bitter with bitter. How so? He places something damaging into something that has been damaged so that a miracle be wrought in it, as in (Isaiah 38:21) "And Isaiah said: Let them take a cake of figs and apply it to the rash and he will recover." Now does not raw flesh, when you apply a cake of figs to it, become putrid? (The resolution:) Place something damaging into something that has been damaged so that a miracle be wrought in it. Similarly, (II Kings 2:21) "And he went to the (polluted) spring and threw salt into it, etc." Now does not even fresh water become putrid when salt is put into it? (The resolution:) Place something damaging, etc. The expounders of metaphors said: He showed him (Moses) words of Torah, which are compared to a tree, viz. (Mishlei 3:18) "It (Torah) is a tree of life to those who hold fast to it, etc." It is not written "Vayarehu etz" ("And He showed him a tree"), but "Vayorehu" ("And He taught him"), as in (Mishlei 4:4) "Vayoreni ('And He taught me') and He said to me: Let My words (of Torah) sustain your heart."