Musar do Pieśń nad pieśniami 2:5

The third: To visit the sick and to heal them. It is thus known that the Divine Presence is lovesick for unification, as it is written (Song of Songs 2:5), "for I am sick with love." And Her healing is in the hand of man, to bring Her proper drugs, as it is written, "Support me with fruitcakes, lay apples below me." And they explained in the Tikkunim (p. 39b) that the secret of fruitcakes (ashishot) is all of the things that are connected to Kingship (Malkhut) - through the man (eesh) [that includes the letter,] hay (five, which is) Kindness, and through the woman (eeshah) [that includes the letter,] yod (ten, which is) Severity, [which] is through the two forearms. And She supports Herself upon them there. And whoever does this supports the patient in his sickness.

And what is "the proper love"? It is that he must love the Lord with a great, mighty and supreme love until his very soul is bound up in the love of the Lord, may He be Blessed, and he is in the ecstasy of that love always, as though he were love sick and his mind cannot for a moment be free, as when a man is infatuated with a woman, and he thinks of her with constant ecstasy, where sitting, rising, eating or drinking. Even more than this must the love of the Lord, Blessed be He, be in the heart of those who love him, ecstatic with longing for Him, as He commanded: "with all your heart and with all your soul" (Ibid.). And this is what Solomon said by way of a parable in the song of Songs: "For I am love sick" (2:5) and the entire Song of Songs is a parable of this love of God.

The Heavenly fire is alluded to in Song of Songs 2,5: סמכוני באשישות, "Sustain me with fires," which the Zohar explains as a reference to the two fires on the altar, the man-made one as well as the fire coming down from Heaven to consume the offerings. In our context the reference would be to the physical fire, representing the body, and the spiritual fire, representing the soul.