Matthew 12:34

34 You brood of vipers, how can you who are evil say anything good? For the mouth speaks what the heart is full of.

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Matthew 12:34 in Other Translations

KJV

34 O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.

ESV

34 You brood of vipers! How can you speak good, when you are evil? For out of the abundance of the heart the mouth speaks.

NLT

34 You brood of snakes! How could evil men like you speak what is good and right? For whatever is in your heart determines what you say.

MSG

34 "You have minds like a snake pit! How do you suppose what you say is worth anything when you are so foul-minded? It's your heart, not the dictionary, that gives meaning to your words.

CSB

34 Brood of vipers! How can you speak good things when you are evil? For the mouth speaks from the overflow of the heart.

Matthew 12:34 Meaning and Commentary

Matthew 12:34

O generation of vipers
Though they boasted of their being the seed of Abraham, yet their immediate ancestors were no other than vipers, deceitful, hurtful, poisonous creatures; and they were exactly like them: for though they made a fair show in the flesh, and outwardly appeared righteous, yet were inwardly full of the poison of wickedness, envy and malice; and which their pestilential breath, their blasphemy against the Spirit, fully discovered; and gave just cause and reason for so severe a reproof, and such resentment, as here made by Christ.

How can ye, being evil, speak good things?
This is not to be expected, nor is it commonly and constantly done; an evil man may sometimes speak good things, or which seem to be so; but these are not his common talk; as he is, so, for the most part, is his language; his speech betrays him: and since these men were by nature evil, were destitute of the Spirit and grace of God, had no good thing in them, how should any good thing come out of them? And since they were so full of wickedness, spite and malice, it is no wonder that they belched out such blasphemous expressions concerning the miracles of Christ;

for out of the abundance of the heart the mouth speaketh:
a phrase much like this is used by the Septuagint, in ( Ecclesiastes 2:15 ) . "I spoke abundance", or "much in my heart"; (dioto o afrwn ek perisseumatov) (lalei) , "for the fool out of his abundance speaketh": as there is abundance of folly in him, there is much delivered out by him; and where there is abundance of wickedness in the heart, if the grace of God is wanting to restrain it, much of it will come out by the lips; as is a man's heart, ordinarily is his language.

Taken from John Gill's Exposition of the Bible

Matthew 12:34 In-Context

32 Anyone who speaks a word against the Son of Man will be forgiven, but anyone who speaks against the Holy Spirit will not be forgiven, either in this age or in the age to come.

33 “Make a tree good and its fruit will be good, or make a tree bad and its fruit will be bad, for a tree is recognized by its fruit.

34 You brood of vipers, how can you who are evil say anything good? For the mouth speaks what the heart is full of.

35 A good man brings good things out of the good stored up in him, and an evil man brings evil things out of the evil stored up in him.

36 But I tell you that everyone will have to give account on the day of judgment for every empty word they have spoken.