Hebrews 6:1 Therefore let us leave the elementary teachings about Christ and go on to maturity, not laying again the foundation of repentance from acts that lead to death, and of faith in God, 2 instruction about baptisms, the laying on of hands, the resurrection of the dead, and eternal judgment.
In John 11:25-26 Jesus tells Martha, whose brother just died, why she can have hope, "I am the resurrection and the life. He who believes in Me will live, even though he dies; and whoever lives and believes in Me will never die." Jesus then asked her if she believed Him. Do you believe that Jesus can raise the dead? The foundational doctrine, "the resurrection of the dead", is our reason for hope when we face death. Everyone who dies having repented of their sin and believed the gospel (Mark 1:15; 1 Corinthians 15:3-4; Romans 10:9) will be raised from the dead (1 Corinthians 15:12-22 - be sure to read this now!)
Because believers in Christ have such a hope, we do not grieve when believers die as others do who have no hope (1 Thessalonians 4:13). When people we love die as believers we have sorrow with rejoicing. We know our beloved is with Jesus (2 Corinthians 5:8) and will one day be raised from the dead just as Jesus was raised from the dead (1 Corinthians 15:22-23).
Let each of us practice daily 1 Peter 1:3 "Praise be to the God and Father of our Lord Jesus Christ! In His great mercy He has given us new birth into a living hope through the resurrection of Jesus Christ from the dead." Look back at the end of your day and see if you were praising the Lord for the hope He has provided for us.