Crossword Genius

"Where ignorance is bliss, ___ folly to be wise": Thomas Gray (3)

Ross

I believe the answer is:

tis

(Other definitions for tis that I've seen before include "I confirm the identity of" , "Pacific trees" , "Sequel to "Angela's Ashes"" , "It is shortened" , "McCourt work" .)

I've seen this clue in The New York Times.
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