This isn't seasonally appropriate, but I'm writing about it now lest I forget.
I've been reading Lamentations recently, and last week I found a verse that seems to be the source for a line in "Go to Dark Gethsemane." (I wrote about the Biblical sources for "Go to Dark Gethsemane" back in November.)
In the second verse, there's the line "Oh, the wormwood and the gall!" and these two things are also mentioned (in this order) in Lamentations 3:19: "Remember my afflictions and my wanderings, the wormwood and the gall!"