Kenneth G. Wilson (1923–). The Columbia Guide to Standard American English. 1993.
thou, thee, thine, thy (prons.)
These archaic forms are second person singular personal pronouns. Thou is nominative, thee, objective, and thy and thine are genitive and absolute genitive. Our familiarity with them comes mainly from the King James Bible, Shakespeare’s plays, and other Renaissance literature. You, your, and yours, once only plural, have now taken over the second person singular function, although some Quakers still use thee as both nominative and objective.
