Once you are dead, you are an absolute zero, no longer affecting eternity, no longer able to see and understand the truth. And the truth is people are made to be happy—forever.
How can you be happy if you are an absolute 0? You are an absolute 0 in the world you just left (You know, of course, that energy, invisible, can neither be created nor destroyed); you achieve happiness in the new life, known as salvation, from the Latin salva, safe. The great Russian writer, Dostoevsky, said he saw Truth in a dream, dressed as a beautiful woman, and Truth meant “Love thy neighbor as thyself.” That is second to love God with your whole heart, so that you may become aware of Truth.
Not that many people read and understand Dostoevsky. Shame.