Php 4:6 Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God.

Php 4:7 And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.

Peace is not the absence of conflict but rather conflict is often required to obtain peace.

Isa 53:5 But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed.