Because the last clothes you'll wear is the white shroud.
Do not be proud of that pimped-out car;
Because the last vehicle you'll ride on is your coffin.
Do not be proud of that luxurious and comfortable bed:
Because the last bed you'll rest upon is the ground.
Do not be proud of your status/position/salutation;
Because the last status/position/salutation you'll have is "Allahyarham".