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Mark 7:20-21
And He said, "What comes out of a man, that defiles a man. For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders,
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Matthew 15:18-20
But those things which proceed out of the mouth come from the heart, and they defile a man. For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies. These are the things which defile a man, but to eat with unwashed hands does not defile a man."
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2 Corinthians 10:4-5
For the weapons of our warfare are not carnal but mighty in God for pulling down strongholds, casting down arguments and every high thing that exalts itself against the knowledge of God, bringing every thought into captivity to the obedience of Christ,
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Genesis 6:5-7
Then the LORD saw that the wickedness of man was great in the earth, and that every intent of the thoughts of his heart was only evil continually. And the LORD was sorry that He had made man on the earth, and He was grieved in His heart. So the LORD said, 'I will destroy man whom I have created from the face of the earth, both man and beast, creeping thing and birds of the air, for I am sorry that I have made them.'
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Jeremiah 17:9-10
" The heart is deceitful above all things,
And desperately wicked;
Who can know it?
I, the LORD, search the heart,
I test the mind,
Even to give every man according to his ways,
According to the fruit of his doings.
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Mark 7:23
All these evil things come from within and defile a man."
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Ephesians 2:1-3
And you He made alive, who were dead in trespasses and sins, in which you once walked according to the course of this world, according to the prince of the power of the air, the spirit who now works in the sons of disobedience, among whom also we all once conducted ourselves in the lusts of our flesh, fulfilling the desires of the flesh and of the mind, and were by nature children of wrath, just as the others.
For more scripture references, please see Bible verses for Thoughts, Evil
Resources
Controlling Our Thoughts
CGG Weekly by Gary MontgomeryIf we desire to live as Christ does, we need to seize control of our thoughts. We can use these three things to help us do this.

Our Battle Against Evil Programming!
Sermon by Martin G. CollinsMilitary strategists have desensitized people to accept killing as normal and acceptable, even as Video games condition people to enjoy killing.
The Reality of Evil
Sermon by Richard T. RitenbaughThe best weapon against the evil of our human nature is to develop the mind of Christ within us to displace our carnal nature.
As a Man Thinks
CGG Weekly by Clyde Finklea'You are what you eat' is a common expression, yet Jesus teaches that actually we are what we think. Even so, we are not always what we think we are.
The Tenth Commandment (1998)
'Personal' from John W. RitenbaughOne commentator said all public crime would cease if this one law was kept. Another said every sin against one's neighbor springs from breaking this commandment.
The Tenth Commandment
'Personal' from John W. RitenbaughEveryone is out to acquire as much as possible for himself. The tenth commandment, however, governs this proclivity of human nature, striking at man's heart.

Avoiding the Ruts of Our Carnal Mind
Feast of Tabernacles Sermon by Bill OnisickIf we could see the traffic of our perpetually wandering minds, we would be embarrassed as to how often it strays from God's thoughts and His laws.
The Commandments (Part Nineteen)
Sermon/Bible Study by John W. RitenbaughJesus taught that all outward sin stems from inner inordinate desire. What we desire or lust after automatically becomes our idol.
For more resources, please see the library topic for Thoughts, Evil