In modern English, 'thou art my' means 'you are mine.'
"How art thou" is an old-fashioned way of asking "How are you?" in Old English. It is a formal or poetic way of inquiring about someone's well-being.
"are you" or "art thou"
"o brother, where art thou?"
"Where art thou" is an archaic way of asking "where are you" in English literature, often associated with Shakespearean language. It is used to inquire about someone's location or whereabouts.
Susan Potter has written: 'Public art in West Sussex' -- subject(s): Art, English, Art, Modern, English Art, Guidebooks, Modern Art, Public art
Thou is the second person singular personal pronoun. All but extinct in spoken Modern English, it has been replaced by the plural form "you."
English no longer uses the second person familiar pronoun ("thou" in the nominative case), so we've also lost the proper verb conjugations that went with it."Art" is the present tense conjugation of the verb "to be" when used with "thou." I am, thou art, he/she/it is, and so forth.Modern English uses the second person plural or formal pronoun ("you") exclusively in situations where "thou" (or the dative case equivalent, "thee") would have been used in Elizabethan or Jacobian times (and even by then, it was regarded as a bit of an affectation; the King James translation of the Bible, which was as might be guessed from the name produced in the Jacobian era, deliberatedly used a style that was rather archaic even by the standards of the times).In other words, translated into modern English, "thou art" = "you are".There are a few peculiar modern dialects of English that have retained the second person familar. Sort of. But this is definitely an affectation, and many of them do it "wrong" by Jacobean standards (among other things, they tend to use "thee" even in the nominative case, and with the verbs conjugated for third person pronouns, eg "Thee is").
The modern English word for "thee" is you. Thee and thou are used the same way as our modern you and your.
"Where are you".
"Thou" is an archaic, informal way of saying "you" in the English language. It was commonly used in early modern English but has largely fallen out of use in contemporary language.
"Thou Art That" by Joseph Campbell has 160 pages in its paperback edition.