Matthew 5:9

Blessed (spiritually calm with life joy in God’s favor) are the makers and maintainers of peace, for they will (express His character and) be called the sons of God.

Strife in relationships, health, thoughts, or in any form, steal the peace from our lives.  A person who is walking according to the word and in peace has a shield against strife.  They can speak into the lives of others and express the character of God.  Well-spoken words inspired by God help restore peace.