The power of Jesus’ words have a holistic effect on the hearer.  The sword is able to cut through all things human and reveal what is inside.

Hebrews 4:
 12For the word of God is living and active. Sharper than any double-edged sword, it penetrates even to dividing soul and spirit, joints and marrow; it judges the thoughts and attitudes of the heart. 13Nothing in all creation is hidden from God's sight. Everything is uncovered and laid bare before the eyes of him to whom we must give account.
 14Therefore, since we have a great high priest who has gone through the heavens, Jesus the Son of God, let us hold firmly to the faith we profess. 15For we do not have a high priest who is unable to sympathize with our weaknesses, but we have one who has been tempted in every way, just as we are—yet was without sin. 16Let us then approach the throne of grace with confidence, so that we may receive mercy and find grace to help us in our time of need.

As the secrets of the heart become exposed by Jesus’, there becomes a division between truth and falsehood, love and lies, purity and sinfulness. 

There are times when following Jesus will cause you to be on your own, distinct from your family.  In times when we are feeling threatened or abandoned we have an identity with Jesus who understands our condition.  We do not run from our family when lines are drawn, but run to Jesus who will equip us with the grace we need to stand. 

Sometimes it is your sin and weakness that causes people to mock and shun your faith.  They see disconnect between what you claim to believe and the brokenness of your condition.  This causes them to speak against the power that you have surrendered to.  In our broken state we cry for God’s mercy on our soul.  The sword of God’s Word penetrates us like a surgeon’s knife to bring correction and healing.