Jude 1:10 Meaning: When What You Know Naturally Destroys You
But these speak evil of whatever things they don’t know. They are destroyed in these things that they understand naturally, like the creatures without reason.
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.
But these rail at whatsoever things they know not: and what they understand naturally, like the creatures without reason, in these things are they destroyed.
and these, as many things indeed as they have not known, they speak evil of; and as many things as naturally (as the irrational beasts) they understand, in these they are corrupted;
But these, whatever things they know not, they speak railingly against; but what even, as the irrational animals, they understand by mere nature, in these things they corrupt themselves.
Meaning in one sentence
Jude 1:10 meaning: The false teachers slandered what they didn't understand and corrupted themselves with instinctual knowledge.
Context
Jude writes with urgency. False teachers have slipped into the church, and his letter is a plea to contend for the faith they are undermining (v. 3). These people defile the flesh, reject authority, and slander beings they cannot see (v. 8). In verse 10, Jude draws a sharp contrast. On one side: things these teachers mock but do not know at all. On the other: the very things they do know by sheer instinct, like animals with no capacity for higher reason. And it is in those familiar, physical areas that they are destroying themselves. Jude wants believers to see that knowledge without reverence is not wisdom. It is the fastest road to ruin.
Key Words
Three Greek words anchor this verse. First, blasphēmeō, the same root we turn into 'blaspheme.' It means to speak evil of, to slander, to revile. The false teachers do this toward things they have no understanding of. The irony is that their mouths are busy condemning what they cannot grasp. Second, phusikōs, 'naturally.' This adverb appears only here in the whole New Testament. It points to what is guided by raw nature, the bodily senses, instinct rather than spirit. Jude contrasts it with the deep, thoughtful knowing of spiritual things. Third, aloga, 'irrational.' The word comes from a (without) and logos (reason). These teachers possess speech but act like creatures that have no reason at all. Their 'knowledge' never rises beyond appetite. That is what makes it so dangerous: instinct without wisdom destroys us.
How Christians Read This Verse
Christians across traditions have read this verse as a warning against living by the senses alone. Matthew Henry and Wesley connect it to the sensual indulgence of the false teachers, people who know only what their bodies crave and then abuse it. Calvin sees a picture of people gorging themselves like pigs in mud, with no moderation. The Cambridge Bible points to the specific sin of sexual perversion hinted at in the context. Others, like Gill, broaden the scope to include slander against Scripture, the law, and the gospel. Despite these diverse emphases, all agree on the core tragedy: humans made for communion with God choose to live like animals, and that choice carries its own destruction.
A common misunderstanding
Some readers take this verse to mean we should never speak critically about anything we have not studied thoroughly. In fact, Jude is not forbidding all questioning or debate. He is describing a specific group who arrogantly mock spiritual realities they have no capacity to perceive. The problem is not honest inquiry; it is dismissive slander from a heart that refuses to learn what God has revealed.
Living This Out
Think about the things you know by instinct. What you reach for when you are tired or angry. The first words that come to your mouth when someone crosses you. Those impulses are real and strong. But you are not just an animal following chemistry. You have the Spirit of God living in you. This week, try a pause before you act on what feels automatic. Ask Him: 'Is this from You, or just from my gut?' That pause, that surrender, is the difference between being governed by instinct and being led by grace.
Main takeaway: When we mock what we do not understand and follow only our instincts, we end up destroying ourselves.
For Families
For ages 5, 8
Animals do what their bodies tell them: eat when hungry, fight when scared. But God gave you a heart and a mind to know Him. You can learn to stop and ask Him what is right before you act.
For ages 9, 12
The people Jude warns about acted like animals. They made fun of things they didn't understand, like angels and God's authority, and they followed every selfish desire they felt. Jude says that way of living destroys you. God gave you His Word and His Spirit so you can choose what is good, not just what feels good in the moment.
Questions People Ask
What things did the false teachers 'speak evil of' that they didn't know?
The context points to spiritual realities: angels, divine authority, and the order God has established (v. 8, 9). These teachers mocked what they could not see or understand, acting as if their ignorance gave them permission to scoff.
What does 'naturally' mean in Jude 1:10?
The Greek word phusikōs appears only here in the New Testament. It describes knowledge gained through the bodily senses and natural instincts, not through spiritual understanding. It is the kind of 'knowing' an animal has: driven by appetite, not by reason or revelation.
How are the false teachers like 'irrational animals'?
The Greek word aloga means 'without reason.' Animals follow instinct without moral reflection. The false teachers, though human, lived the same way: they let their bodily desires rule them and never rose to the higher knowledge of God that could have guided their lives.
Does Jude 1:10 mean all instinctual knowledge is bad?
Not at all. Natural knowing, hunger, thirst, pain, is part of being human. The problem is when we let those instincts rule us without submitting them to God. The false teachers' destruction came from living entirely by instinct, never by faith.
How is Jude 1:10 related to 2 Peter 2:12?
Both passages describe the same kind of false teachers using nearly identical language. Peter writes that they are 'unreasoning creatures, born natural animals to be taken and destroyed,' speaking evil of what they are ignorant of. The two letters likely address a similar threat in different regions.
For pastors & researchers
Greek interlinear, 8 commentaries & word study