Do not think that I came to send peace upon earth: I came not to send peace, but the sword. -- Mt. 10:34
The sword that Jesus came to send is Himself, the image of the invisible God; "the word of God is living and effective, sharper than any two-edged sword."
The sword of Jesus divides the earth into those who belong to God and those who don't. Here is an image of the God to whom some belong and others don't:
Little wonder that the call, "Follow me," causes strife within households, and even within individuals.