Certainly, this world is a house of truth for him who appreciates it; a place of safety for him who understands it; a house of riches for him who collects provision from it (for the next world); and a house of instructions for him who draws instruction from it. It is the place of worship for the lovers of Allah; the place of praying for the angels of Allah; the place where the revelation of Allah descends; and the marketing place for those devoted to Allah. Herein they earned mercy and herein they acquired Paradise by way of profit.