Research doesn't agree on exactly when the Quakers resurrected the pronoun "thee" and declared it the preferred term for plain speech, but certainly by the 1800s, it was commonplace.
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In the Old English, "thee" was the singular pronoun, equal to he or she. "Thou" was the plural pronoun, equal to they. Most research - but not all - supports the notion that the Quakers dropped the use of "thou" because they saw it as prideful. As modern day language recognizes "you" as both singular and plural, the Quakers used "thee" as both.
"Thee is well-read on this subject."
"Thee are a happy lot."
"Is that all thee has to do?"
"No matter what thee have, 'tis enough."
All are correct, if you're a Quaker in the 19th Century.
Pegg Thomas - Writing historical fiction with a touch of humor.