Does it seem likely that God would exhort us to peace, but not give us the grace to practice it? God gives us that grace through his Church, the Sacraments and Scripture. In the Book of Revelation, God invites us through St. John to enter heaven with him and there look at how God sees things. This is a great grace for us.
God also sends us his Holy Mother. It is through her that Our Lord came to us the first time. It is through her, according to St. Louis de Montfort in True Devotion to Mary, that Christ will come again! Pope St. John Paul II attributes this work as being a “decisive turning point” in his life.