“Think not that I am come to send peace on earth: I came not to send peace, but a sword. For I am come to set a man at variance against his father, and the daughter against her mother, and the daughter in law against her mother in law. And a man's foes shall be they of his own household.” Matthew 10:34–36
Jesus is telling the disciples that He came not to bring peace to the world, but a sword. Jesus’ sword was never a literal one. In fact, when Peter took up a sword to defend Jesus in the Garden of Gethsemane, Jesus rebuked him and told him to put away his sword, "Then said Jesus unto him, Put up again thy sword into his place: for all they that take the sword shall perish with the sword.” Matthew 26:52
Among the names of Jesus the Christ is that of Prince of Peace. Such verses as Isaiah 9:6, Luke 2:14, and John 14:27 make it clear that Jesus came to bring peace, but that peace is between the man and God. Those who reject God and the only way of salvation through Jesus (John 14:6) will find themselves perpetually at war with God. But those who come to Him in repentance will find themselves at peace with God. Because of Christ’s sacrifice, we are restored to a relationship of peace with God (Romans 5:1).
Still, it is inevitable that there will be conflict between good and evil, the Christ and the antichrist, the light and the darkness, the children of God (believers) and the children of the devil (those who refuse Christ). Conflict must arise between the two groups, and this can and does happen within a family in which some are believers and others are not. We should seek to be at peace with all men but should never forget that Jesus warned we will be hated for His sake. Because those who reject Him hate Him, they will hate His followers as well (John 15:18).
In Matthew 10:34–36, Jesus said He had come at this time not to bring peace to the earth, but a sword, a weapon which divides and severs. As a result of His visit to the earth, some children would be set against parents and a man’s enemies might be those within his own household. This is because many who choose to follow Christ are hated by their family members. This may be part of the cost of discipleship, for love of family should not be greater than love for the Lord. A true disciple must take up his cross and follow Jesus (Matthew 16:24). He must be willing to face not only family hatred, but also death, like a criminal carrying his cross to his own execution. True followers of Christ must be willing to give up, even to the point of “hating” all that is in our lives, even our own families, if we are to be worthy of Him (Matthew 10:37–39). In so doing, we find our lives in return for having given them up to Jesus the Christ.