As compared with the pleasures and luxuries, which are in store for a true believer in Jannah in the Hereafter, this world is a prison; and against the ceaseless torture that awaits the Kuffar (disbelievers) in Hell, this world is a Jannah for them. It can also mean that the way a Muslim saves himself in life from lusts and desires and leads a pious life with fear of Allah, this world is a prison for him because he is fettered in the chains of rules and regulations, while a Kafir (disbeliever) is free from all kinds of restrictions and is completely given to lusts and desires, and this is how this world is a Jannah for him. The purpose of this Hadith is to induce Muslims for the preparation of Al-akhirah (the Hereafter) and prevent them from unlawful luxuries of this world.