σύ, pron. of 2nd of person(s), thou, you, genitive, σοῦ, dative, σοί, accusative, σέ, pl., ὑμεῖς, -ῶν, -ῖν, -ᾶς (enclitic in oblique cases sing., except after prep. (BL, §48, 3), though πρὸς σέ occurs in Mat.25:39). Nom. for emphasis or contrast: Refs Jhn.1:30, 4:10, 5:33, 39, 44, Act.4:7, Eph.5:32; so also perhaps σὺ εἶπας, Mat.26:64, al. (M, Pr., 86); before voc., Refs Mat.2:6, Luk.1:76, Jhn.17:5, al.; sometimes without emphasis (M, Pr., 85f.), as also in cl., but esp. as rendering of Heb. phrase, e.g. υἱός μου εἶ σύ (בְּנִי־אַתָּה, Refs Psa.2:7), Act.13:33. The genitive (σοῦ, ὑμῶν) is sometimes placed bef. the noun: Refs Luk.7:48, 12:30, al.; so also the enclitic σοῦ, Mat.9:6; on τί ἐμοὶ κ. σοί, see: ἐγώ. (AS)
The personal pronoun of the second person singular; thou
G4572 σεαυτοῦ, σεαυτῷ, σεαυτόν, σαυτοῦ, σαυτῷ, σαυτόνσεαυτοῦ, σεαυτῷ, σεαυτόν, σαυτοῦ, σαυτῷ, σαυτόν
seautou seautō seauton sautou sautō sauton
The genitive case from G4571 and G846, with the dative and accusative of the same with contractions, respectively, of (with, to) thyself
KJV Usage: thee, thine own self, (thou) thy (-self).