Because the riches that he hath gotten are perished.
Riches are ever liable to perish
Prosperity is not to be deemed the greatest security. The lofty unbending cedar is more exposed to the injurious blast than the lowly shrub. The little pinnace rides safely along the shore, while the gallant ship advancing is wrecked. Those sheep which have the most wool are generally the soonest fleeced. Poverty is its own defence against robbery. Who would snake those trees upon which there is no fruit? (T. Secker.).