Why might Shakespeare use thy or thee rather then you in a characters speech what might be the purpose of change in wording

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Thee, Thou, Thy and Thine (You and Your)

It’s a common myth that Shakespeare never uses the words "you" and "your" - actually, these words are commonplace in his plays. However, he also uses the words "thee / thou" instead of "you" and the word "thy / thine" instead of "your". Sometimes he uses both "you" and "thy" in the same speech. This is simply because in Tudor England the older generation said "thee" and "thy" to denote a status or reverence for authority. Therefore when addressing a king the older "thou" and "thy" would be used, leaving the newer "you" and "your" for more informal occasions. Soon after Shakespeare’s lifetime, the older form passed away!