“Thou” is today’s Wikipedia Fetatured Article.

The word thou (pronounced IPA [ðaʊ]) is a second person singular pronoun in English. It is now largely archaic, having been replaced in almost all contexts by “you”. Thou is the nominative form; the oblique/objective form is thee (functioning as both accusative and dative), and the possessive is thy or thine. . .

Thou ought to read it.