Contradiction with Proverbs 15:1
Proverbs 15:1 advises a soft answer to turn away wrath, which contrasts with Psalms 140:2's depiction of those that imagine mischief in their hearts, suggesting a hostile disposition.
Proverbs 15:1: A soft answer turneth away wrath: but grievous words stir up anger.
Contradiction with Matthew 5:9
This verse highlights the blessing of peacemakers, which contradicts the imagery in Psalms 140:2 of those continually imagining and stirring up conflicts.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with Romans 12:18
Encourages living peaceably with all men, in contrast to the devising of mischief and wars stated in Psalms 140:2.
Romans 12:18: If it be possible, as much as lieth in you, live peaceably with all men.
Contradiction with Proverbs 12:20
Suggests joy is found in promoting peace rather than the mischief and wars described in Psalms 140:2.
Proverbs 12:20: Deceit [is] in the heart of them that imagine evil: but to the counsellors of peace [is] joy.
Contradiction with 1 Thessalonians 5:15
Entreats returning good for evil, which contrasts with the malice and intent for conflict in Psalms 140:2.
1 Thessalonians 5:15: See that none render evil for evil unto any [man]; but ever follow that which is good, both among yourselves, and to all [men].