Thy, Thine, Thine own, Thyself - Vine's Expository Dictionary of New Testament Words
Thy, Thine, Thine own, Thyself
* Note: These are translations of(1) the possessive pronoun sos, and its inflections, e.g., Matthew 7:3 (1st part); it is used as a noun with the article, in the phrases to son, that which is thine," Matthew 20:14; Matthew 25:25, "thine own;" hoi soi, "thy friends," Mark 5:19; ta sa, "thy goods," Luke 6:30, lit., "the thine;"
(2) one of the oblique cases of su, "thou;" sou, "of thee," e.g., Matthew 1:20; Matthew 7:3 (2nd part), "thine own;" soi, "to thee," e.g., Mark 5:9; with meno, "to remain," Acts 5:4 (1st part), "thine own," lit., "remain to thee;" in Matthew 26:18, pros se, "at they house," lit., "with thee;"
(3) seauton, "(as) thyself," Romans 13:9; seautou, "of thyself," e.g., Matthew 4:6; seauto, "to thyself," Acts 16:28;
(4) heautou (with apo, "from"), John 18:34, "of thyself," lit., "from thyself;"
(5) autos, "self," is sometimes used for "thyself," e.g., Luke 6:42.