Medicine

If faith in G-d were always fixed in the hearts of every person, and "G-d were his trust" (Yirmiyahu 17:7), he would certainly not need medicines or anything but the grace of G-d, arousing the love of G-d, may He be blessed, to restore him either by means of prayer or by means of studying the holy Torah.

(Degel Machaneh Ephraim)