חסידות אויף ירמיהו 31:20

The sign [or mnemonic] has no [actual] relation to the essence of the matter, but is merely a memory aide, as stated,⁹Jeremiah 31:20 “Make signs for yourself.”

This is *the fire of love* of which it says (Song_of_Songs.8.7) "Many waters cannot quench the love." As we find (Sotah 21a), "A sin extinguishes a mitzvah, but does not extinguish Torah." (The Sages (Vayikra_Rabbah.2.3) similarly expounded the verse (Jeremiah.31.20) "A darling child to Me is Ephraim... whenever I just speak with him" -- "sufficient is My Speaking that I placed within him.") And it says (Jeremiah.23.29) "My words are like fire, declares the Lord."