Thomas Boston, Works, 4:343:
Christ is the procurer and purchaser of his people’s peace. Their peace was bought, not stolen nor usurped, bought by his own blood. No peace could have been to men, had he not stooped and received the blow of the sword of justice. He denied himself to peace, that we might enjoy it. He is the maker of the peace, being the great peace maker, and the Mediator of the covenant betwixt God and man, which is a covenant of peace. Peace on earth was sung at his birth; and when he is formed in a soul, peace is made betwixt God and that soul; and by his Spirit, peace is created in the soul.
Source: http://www.puritanboard.com/f25/their-peace-bought-not-stolen-84220/, Comment #1