Matthew 12:34-35
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Jesus isn't just saying that bad people say bad things. He's emphasizing that what overflows from our mouths—even seemingly casual words—reveals the deep, often hidden, condition of our inner selves. The "abundance" implies that our hearts are so full of something that it has to spill out, exposing its true contents.
You brood of vipers! How can you speak good, when you are evil? For out of the abundance of the heart the mouth speaks. The good person out of his good treasure brings forth good, and the evil person out of his evil treasure brings forth evil.
English Standard Version (ESV)
Jesus has just declared the tree known by its fruit, meaning people are known by their actions and words. He then directly confronts the Pharisees, calling them "brood of vipers" because their wicked hearts are producing only evil speech and accusations against him. This powerful statement emphasizes that their outward words are a direct reflection of their inner corruption.
Jesus calls the Pharisees a 'brood of vipers.' What's behind such a harsh-sounding insult, and why is it so important to understand?
A Diagnosis, Not Just an Insult
When Jesus calls the Pharisees a 'brood of vipers,' it’s a deeply symbolic and diagnostic statement. Vipers are known for their venom, a potent poison that kills. In the same way, these religious leaders were injecting spiritual poison into people’s lives through their corrupt teachings and hypocrisy.
It wasn't just a name-calling session. Jesus was revealing their true nature: inherently evil and dangerous to those around them. Like a viper's bite, their words and actions, though perhaps appearing religious on the outside, carried a deadly spiritual consequence. They weren't just mistaken; they were fundamentally corrupt.
Ever wonder why you sometimes say things you don't mean, or why certain words just 'come out'? Jesus gives us the ultimate clue.
The Heart's Overflow
The second part of the verse, 'For out of the abundance of the heart the mouth speaks,' is the key to understanding Jesus' point. The word 'abundance' here speaks of an overflowing, something that is so full it can't be contained.
Think of it like a cup filled to the brim. Whatever is in the cup will spill out when it’s jostled. Our hearts are like that cup. What we store inside—our true thoughts, desires, beliefs, and attitudes—will eventually spill out through our words and actions.
If our hearts are filled with bitterness, anger, or deceit, that's what will come out. If they are filled with God's love, truth, and goodness, then those are the things that will overflow. Jesus was pointing out that the Pharisees’ hateful words were not random; they were a direct symptom of the corrupt 'treasure' stored in their hearts.
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Understand the original words
echidna · Greek Noun
A metaphorical description of the Pharisees, characterizing them as treacherous, deceitful, and spiritually deadly. It highlights the satanic influence behind their opposition to the ministry of Christ.
kardia · Greek Noun
The center of human personality, encompassing the will, intellect, and emotions. It is the seat of moral choices and the source of all outward expressions, whether righteous or wicked.
thesauros · Greek Noun
Used metaphorically to represent the inner reservoir or storehouse of one's character, beliefs, and intentions. This 'treasure' determines the quality of what a person produces in life.
Jesus' harsh words here are not random anger, but a pointed response to the Pharisees' persistent accusations and hypocrisy, especially after He performed a miraculous healing. He's exposing the rotten core beneath their religious facade.
c. AD 28
Jesus begins public ministry
Jesus begins His public ministry in Galilee, teaching, healing, and gathering disciples. This period is marked by growing crowds and increasing opposition from religious leaders.
c. AD 29— this verse
Jesus heals on the Sabbath
Jesus performs miracles, including healing on the Sabbath, which directly challenges the Pharisees' strict interpretation of the Law. This leads to increased conflict and accusations against Him.
c. AD 30
Growing opposition and threats
As Jesus' popularity and influence grow, so does the hostility of the Pharisees and other religious leaders. They begin to plot against Him, seeking ways to discredit and eliminate Him.
This passage directly echoes Jesus' teaching, stating that a person's words reveal the condition of their heart, whether good or evil. It reinforces the idea that what we say is a direct outflow of our inner being.
Matthew 15:18-19Here, Jesus explains that evil thoughts, which lead to evil speech and actions, originate from within the human heart. This provides further context for the 'abundance of the heart' producing what is spoken.
James 3:10-12James highlights the contradictory nature of using the tongue for both praise and cursing, likening it to a single spring producing both fresh and bitter water. This illustrates the 'brood of vipers' idea, showing how an unrighteous nature can produce poisonous speech.
Proverbs 10:11This proverb states that the mouth of the righteous is a fountain of life, while the mouth of the wicked conceals violence. It contrasts the positive and negative 'overflowings' of the heart, mirroring Jesus' point about good and evil speech.
barnesMatthew 12:34: "O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh."
O generation of vipers! - Christ here applies the argument which he had suggested in the previous verse. They were a wicked race; like poisonous reptiles, with a corrupt and evil nature. They could not be expected to speak good things - that is, to speak favorably of him and his works. As the bad fruit of a tree was the proper effect of its "nature," so w…
pulpitMatthew 12:34: "O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh."
Verse 34. - The first clause is in Matthew only. O generation (ye offspring, Revised Version) of vipers (Matthew 3:7, note). Observe that the figure of the tree had also been used by the Baptist (Matthew 3:10). How can ye. It is against nature. Being evil; i.e. inherently worthless (Matthew 6:13, note); cf. πονηροὶ ὄντες, Matthew 7:11. Speak good things.…
Jesus isn't just saying that bad people say bad things. He's emphasizing that what overflows from our mouths—even seemingly casual words—reveals the deep, often hidden, condition of our inner selves. The "abundance" implies that our hearts are so full of something that it has to spill out, exposing its true contents.
Jesus has just declared the tree known by its fruit, meaning people are known by their actions and words. He then directly confronts the Pharisees, calling them "brood of vipers" because their wicked hearts are producing only evil speech and accusations against him. This powerful statement emphasizes that their outward words are a direct reflection of their inner corruption.
Jesus has just declared the tree known by its fruit, meaning people are known by their actions and words. He then directly confronts the Pharisees, calling them "brood of vipers" because their wicked hearts are producing only evil speech and accusations against him. This powerful statement emphasizes that their outward words are a direct reflection of their inner corruption.
"You brood of vipers! How can you speak good, when you are evil? For out of the abundance of the heart the mouth speaks. The good person out of his good treasure brings forth good, and the evil person out of his evil treasure brings forth e…" — Jesus isn't just saying that bad people say bad things. He's emphasizing that what overflows from our mouths—even seemingly casual words—reveals the deep, often hidden, condition of our inner selves.…
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Last reviewed October 2026
