“You are the salt of the earth, but if salt has lost its taste, how shall its saltiness be restored? It is no longer good for anything except to be thrown out and trampled under people’s feet.” Matthew 5:13

kit: Woodland Autumn by Kristin Aagard, template by JenC Designs

context:

“You are the salt of the earth, but if salt has lost its taste, how shall its saltiness be restored? It is no longer good for anything except to be thrown out and trampled under people’s feet. You are the light of the world. A city set on a hill cannot be hidden. Nor do people light a lamp and put it under a basket, but on a stand, and it gives light to all in the house. In the same way, let your light shine before others, so that they may see your good works and give glory to your Father who is in heaven. Matthew 5:13-16

Notice that right before the above passage, Jesus talks about persecution. Throughout the beatitudes, none of them are elaborated upon until the last one, when he adds "rejoice and be glad" to the blessing for persecution for His sake:

Seeing the crowds, he went up on the mountain, and when he sat down, his disciples came to him. And he opened his mouth and taught them, saying: “Blessed are the poor in spirit, for theirs is the kingdom of heaven. Blessed are those who mourn, for they shall be comforted. Blessed are the meek, for they shall inherit the earth. Blessed are those who hunger and thirst for righteousness, for they shall be satisfied. Blessed are the merciful, for they shall receive mercy. Blessed are the pure in heart, for they shall see God. Blessed are the peacemakers, for they shall be called sons of God. Blessed are those who are persecuted for righteousness’ sake, for theirs is the kingdom of heaven. Blessed are you when others revile you and persecute you and utter all kinds of evil against you falsely on my account. Rejoice and be glad, for your reward is great in heaven, for so they persecuted the prophets who were before you. Matthew 5:1-12

So clearly, being a "peacemaker" does not ensure that a person will have peace by the world's definition.

Peace I leave with you; my peace I give to you. Not as the world gives do I give to you. Let not your hearts be troubled, neither let them be afraid. John 14:27

If the world hates you, know that it has hated me before it hated you.  If you were of the world, the world would love you as its own; but because you are not of the world, but I chose you out of the world, therefore the world hates you.  Remember the word that I said to you: ‘A servant is not greater than his master.’ If they persecuted me, they will also persecute you. If they kept my word, they will also keep yours.  But all these things they will do to you on account of my name, because they do not know him who sent me. John 15:18-21