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Aelyria wrote:

"Thou" is for the subject of a phrase, same as "he"/"she", "they", or "I":
"I know I'm a million times as humble as he is."
-> "I know I'm a million times as humble as thou art."
And
"She was the best of us, and she shall be missed." -> "Thou wert the best of us, and thou shalt be missed."

"Thee" is for the object of a phrase, same as "him"/"her", "me", or "them":
"I wrote this entry for them, because I wanted them to know.” -> "I wrote this entry for thee, because I wanted thee to know."
And
"What should I get for him? It's important that I make him happy." -> "What should I get for thee? It's important that I make thee happy."

Finally, "thy" is the common possessive pronoun (e.g. "my", "your," "his/"her", "their") and "thine" is either "thy" immediately before a vowel, or the possessive adjective, used in the places you would use "mine"/"hers"/"theirs" e.g. "That book is mine" not "That book is my".