Contradiction with James 2:14
This verse raises the idea of faith being incomplete without works, which can be seen as contradicting Ephesians 6:15's focus on readiness of the gospel of peace being part of the armor of God, which emphasizes faith elements without explicitly mentioning works.
James 2:14: What [doth it] profit, my brethren, though a man say he hath faith, and have not works? can faith save him?
Contradiction with Matthew 10:34
Jesus states He did not come to bring peace but a sword. This contradicts Ephesians 6:15 which emphasizes readiness with the gospel of peace as part of one's spiritual armor.
Matthew 10:34: Think not that I am come to send peace on earth: I came not to send peace, but a sword.
Contradiction with Luke 12:51
Jesus asks if He brings peace on earth and answers with division, contradicting the peaceful message in Ephesians 6:15.
Luke 12:51: Suppose ye that I am come to give peace on earth? I tell you, Nay; but rather division:
Contradiction with Ecclesiastes 3:8
Describes a time for war and a time for peace, suggesting that peace is not a constant state unlike the readiness of peace described as a necessity in Ephesians 6:15.
Ecclesiastes 3:8: A time to love, and a time to hate; a time of war, and a time of peace.
Contradiction with Jeremiah 6:14
Accuses people of declaring "Peace, peace" when there is no peace, contradicting the assurance of the gospel of peace mentioned in Ephesians 6:15.
Jeremiah 6:14: They have healed also the hurt [of the daughter] of my people slightly, saying, Peace, peace; when [there is] no peace. [hurt: Heb. bruise, or, breach]