The second death is the death from which there is no resurrection. God allows his saints to experience physical death for reasons that are wise and advantageous, nevertheless he will raise them from it.
What a tragedy when Christ has died, when you have instinct for God, when your spirit has been moved but not irresistibly in your life. The Lord is rich and merciful. The Lord is very kind. Come to him before it is too late. From that moment there will be and can be no more death for believers. Now the world is full of death. It is scored deeply into the biology of the world. But once final judgement comes, there will be no more death in the newly created earth. There will be massive destruction of the world, but it will be remade in absolute beauty.