ULAANBAATAR, Mongolia (CNS) -- Like the land struck by a "zud," the human heart has a thirst and longing that can be alleviated only by the God of love, Pope Francis told Mongolians gathered for Mass in Ulaanbaatar's Steppe Arena. Countless generations of Mongolians have feared the "zud," an extreme weather event of drought or impenetrable ice, that decimates herds and flocks.