σεαυτοῦ (pro 2nd masc sg nom) [3 verses] (pro 2nd masc sg nom) "Yourself" is  seautou, which means "of yourself." It is the reflexive form of the second-person pronoun.  - The "yourself" is the second-person reflexive pronoun.

σέβονταί [3 verses]( verb 3rd pl pres ind mp) "Do they worship" is from sebomai, which means "feel awe", "full of awe", "feel fear" or "feel shame," before God, "fear to do", "revere, ""honour", "respect", "approve", and "worship". In Hebrew, the sense of fear is more direct. The single word, yir'ah, which means "fear", "awe," or "fear of God." -- Worship" is from a verb that means "feel awe", "full of awe", "feel fear" or "feel shame," before God, "revere, ""honor", "respect," and "worship".

σεισμοὶ [3 verses](noun pl masc nom) "Earthquakes" is seismos, which means "shaking," "earthquake," "shock," "agitation," "commotion," "blackmail," and "extortion."

σελήνη [3 verses](noun sg fem nom) "Moon" is selene, which means "moon," "full moon," "month," and is the name of the goddess of the moon. -- "Moon" is the noun that means "moon," "full moon," "month," and is the name of the goddess of the moon.

σημεῖα [15 times](noun pl neut acc) "Signs" is from semeion, which means "mark (by which things are known)," "a proof" (in reasoning), "sign (of the future)," "sign from the gods," "signal (to do things)," "omen," "portent," "constellations," and a "standard (flag)." - "Sign" is Greek word that means a "mark," "sign," or "proof." The word in Greek is used specifically to means a sign from the gods and it that sense, it means "omen," "portent," and "constellations," but it also means a "proof" in reasoning. The translation of "proof" often seems how Jesus uses it.