Wikepedia unfortunately, but I am sure the original tweeter and Cardinal Cupich (both linked in the tweet will be contactable)
Aarti is derived from the Sanskrit word आरात्रिक (
ArAtrika ) which means something that removes
rātrī , darkness (or light waved in darkness before an icon).
[1][2][3] A Marathi language reference says
[4] it is also known as
Mahaneeranjana (Sanskrit: महानीराञ्जना).
[5]
Aarti is said to have descended from the
Vedic concept of fire rituals, or
homa . In the traditional aarti ceremony, the flower represents the earth (solidity), the water and accompanying handkerchief correspond with the water element (liquidity), the ghee or oil lamp represents the fire component (heat), the peacock fan conveys the precious quality of air (movement), and the yak-tail fan represents the subtle form of ether (space). The incense represents a purified state of mind, and one’s “intelligence” is offered through the adherence to rules of timing and order of offerings. Thus, one’s entire existence and all facets of material creation are symbolically offered to the Lord via the aarti ceremony.
[6] The word may also refer to the traditional Hindu devotional song that is sung during the ritual.