When David wrote, “Yea, though I walk through the valley of the shadow of death, I will fear no evil” (v.4), he was in a place where evil was an ever-present reality. Yet he refused to give in to fear. He wasn’t expressing hope that God would abolish evil so that he could pass through safely; he was saying that the presence of God gave him the confidence to pass through difficult places without fear of being deserted by Him. In another psalm, David said that the Lord was his hope (71:5).
Many claim to have hope, but only those whose hope is Christ can claim it with certainty. Hope comes not from strength, intelligence, or favorable circumstances, but from the Lord. As Maker of heaven and earth, He alone has the right to promise hope and the power to keep the promise.
Hope is a certainty—because its basis is God.(RBC)