Into every life some sorrow must come. That's part of being human. The Buddha put it succinctly when he said that in life there was suffering. Jesus told us to pick up our cross every day and follow him.
We lose people, positions, our health. Eventually our bodies die. All material and mental forms are impermanent.
And yet, it's at the depth of sorrow, that we're able to let go of our ego, let go of our attachments. By accepting our sorrow, we may fall into that abyss of light, where we realize the truth of God's love within us, and all around us.