What does it mean to take a bath and burn incense?

Taking a bath and burning incense means: burning incense cleanly and worshipping Buddha, indicating piety to the gods (Buddha). Now it means to be obsessed with something to a certain extent.

"Bathing and burning incense, playing the piano and enjoying chrysanthemums" is the ultimate expression of the ancients' pursuit of elegance. Last semester in grade five, lesson 29, the character of books, section 3.