On the 40th anniversary of the historic Day of Prayer for Peace, convened by Pope John Paul II on October 27, 1986, the legacy of the “Spirit of Assisi” spans four pontificates. From John Paul II himself, who explored its theological significance, to Benedict XVI, who extended the dialogue to include non-believers; from Francis, who calls for fraternity, to Pope Leo XIV, who invites religions to rediscover within their own roots an antidote to hatred and violence.