For to me, to live is Christ and to die is gain. (NIV)
Death for the believer brings a better life than this earthly existence.
And I heard a voice from heaven saying, “Write this down: Blessed are those who die in the Lord from now on. Yes, says the Spirit, they are blessed indeed, for they will rest from their hard work; for their good deeds follow them!” (NLT)
Those who die in the Lord are blessed. That means happy. They rest (as in "vacation"), they are rewarded for the good they did. And my son did so much good.
Precious in the sight of the LORD is the death of his saints. (NIV)
God is tender toward his children when they die, and the bereaved who are left behind. The pain is not inconsequential to God.
If we live, we live to the Lord; and if we die, we die to the Lord. So, whether we live or die, we belong to the Lord. (NIV)
We belong to him, in life and in death. We are never out of His hand or heart. God's relationship with us is steady.
But our citizenship is in heaven. And we eagerly await a Savior from there, the Lord Jesus Christ, who, by the power that enables him to bring everything under his control, will transform our lowly bodies so that they will be like his glorious body. (NIV)
Heaven is our true home. The earthly life is preparation for the life to come, not an end in itself. The best is yet to come. And He says our bodies will be like his resurrected body.
Jesus said to her, "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. Do you believe this?" (NIV)
Anyone who believes in Christ never truly dies. They only die to this world. They shed their earthly skin for an eternal body and live fully on the other shore.