Halakhah su Giudici 6:45

From the roots of the commandment, [we need to] preface [that] the thing is known amongst us and among every sage that the great miracles that God does for people in His great goodness, He always does hiddenly. And these matters appear a little as if they were truly done by way of nature, or close to nature. As even with the miracle of the splitting of the sea – which was an open miracle – it is written there (Exodus 14:21), "and the Lord moved the sea with a powerful Eastern wind all of the night, and He made the sea into a dry place and He split the waters." And the enlightened ones will understand that this matter of concealment is because of the loftiness of the Master and the lowliness of the receiver. And due to this matter did He command us to burn fire on the altar, even though fire descended there from the Heavens – in order to hide the miracle. It [also] appears that the fire that came down from the Heavens was not visible when it came down because of the reason that we said – except for the eighth day of the inauguration and that of Gidon (Judges 6:21), Manoach (Judges 13:20) (and of Eliyahu), which was visible.