What Does Jude 1:10 Mean?
But these speak harm against whatever they do not perceive, and whatever they understand by nature, like wordless living creatures, in these things they decay.
Key words are shown with the Hebrew or Greek and what each word meant.
Selah Decoded Version The Selah Decoded Version renders what the Hebrew and Greek words meant to the people who first heard them.
King James wording
King James Version
But these speak evil of those things which they know not: but what they know naturally, as brute beasts, in those things they corrupt themselves.THE KEY
What they grasp by instinct is not a refuge from ruin; it is where their decay takes hold.
THE MEANING
The verse names two limits: they speak injuriously about what lies beyond their knowledge, and what they grasp by instinct, like unreasoning animals, becomes the place of their ruin. Familiarity with the natural does not amount to full perception. The danger unfolds inside what they already know.
WHAT THIS UNDOES
It undoes the belief that whatever feels natural or familiar must therefore be safe or reliable.
THE ROOT
φθείρονται
phtheirontai
GROWS FROM
φθείρω
phtheirō
to spoil, decay, corrupt, or ruin
The verb φθείρονται (phtheirontai, are corrupted or ruined) places the ruin in the very things they know by instinct. Its word family also names corruption and perishability, giving the image a sense of decay taking hold from within.
ALSO GROWS
phthora: corruption, decay, destruction
φθορά
This noun makes clear that the root can describe a process of deterioration, not only a deliberate act of wrongdoing.
phthartos: perishable, subject to decay
φθαρτός
This branch links the verse’s ruin to what is already vulnerable to decay.
ἐπίστανται
epistantai
GROWS FROM
ἐπίσταμαι
epistamai
to understand, know, or be acquainted with
English uses “know” twice, but the first clause has οἴδασιν (oidasin, know or perceive), while this clause has ἐπίστανται (epistantai, understand or be acquainted with). The distinction separates what lies beyond their perception from what they know by nature, and says that this familiar knowledge is where ruin takes hold.
ALSO GROWS
epistēmē: knowledge, understanding
ἐπιστήμη
This noun shares the word family and shows its link to what is known or understood.
epistēmōn: knowledgeable, skilled
ἐπιστήμων
This related word describes a person marked by understanding, widening the family beyond a single act of knowing.
βλασφημοῦσιν
blasphēmousin
GROWS FROM
βλασφημέω
blasphēmeō
to slander or speak injuriously
“speak harm against” in this verse is blasphēmousin. The speech verb belongs to the same family as “blasphemy,” but here its target is what they do not know. The root describes injurious speech that defames, not simply discussion or questioning.
ALSO GROWS
blasphēmia: slander, abusive speech, blasphemy
βλασφημία
This noun carries the same injurious quality as the speech Jude names.
blasphēmos: slanderous, abusive
βλάσφημος
This related adjective shows the root can describe the character of speech as well as the act of speaking.
THE PATTERN
When instinct or human judgment is treated as sufficient, it cannot protect a person from a path that ends in ruin.
There is a way straight before a man, but its latter end is the ways of death.Yet a person who carries weight does not lodge; he is made like the beasts, and falls silent.Claiming themselves to be wise, they were made fools.THE THREAD
Do not wander; bad company rots good habits.Jude’s φθείρω (phtheirō, ruin or corrupt) appears again here in “corrupt.” The shared root connects the ruin within a person to the way harmful company can spoil what is good.
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