This is a parallel-text presentation of 1 John 4:1–21 from the New Testament, displayed in three versions side by side: the Greek New Testament (GNT), the King James Version (KJV) with Strong's concordance numbers embedded, and the Latin Vulgate (Vul). The passage divides into two major movements: verses 1–6 urge believers to "test the spirits" to distinguish true from false prophecy, with the doctrinal test being whether a spirit confesses that Jesus Christ came in the flesh — those who deny this are identified with the spirit of antichrist. Verses 7–21 develop the epistle's central theological claim that "God is love" (ὁ θεὸς ἀγάπη ἐστίν / *Deus caritas est*), arguing that mutual love among believers is both evidence of divine indwelling and an obligation grounded in God's prior act of sending his Son as propitiation for sin. A distinctive and forceful claim closes the passage: anyone who claims to love God while hating a fellow believer is called a liar, since love of the visible neighbor is the necessary condition for love of the invisible God. The KJV column's inline Strong's numbers make this resource primarily useful for word-level Greek-English-Latin comparison and concordance study rather than devotional reading.