Sentence to Ponder

From Johannes Tauler, Sermon 21…

“You ought to seek joy in sadness, detachment in the midst of disaster, and comfort in bitterness; this is the way to become a true witness of God.”

That is the stew that Luther came out from, a mysticism formed by the black death. To what extent would modern therapeutics say detachment is just avoidance or denial? What God does this witness too?