Centuries ago, Isaiah prophesied a child would be born, a sage. The government would be upon his shoulder. He would be called Wonderful, Counselor, The Mighty God, the Everlasting Father, the Prince of Peace (italics mine). Along with scores of other Old Testament prophecies, this passage points to Jesus of Nazareth who came with an offer of peace. "Peace I leave with you, my peace I give unto you; not as the world giveth, give I unto you."
Those who follow Jesus Christ can experience His peace in the storms of life as well as on calm "summer" days. It's a tranquility of the soul, based on trust, trust in God's love and protection.
Some day, Jesus will return at His second coming and will bring peace to the world. But for now, what a glorious thing it is to be able to be at peace even when the world is in turmoil.