I am a muslim. This quote is beautiful if only someone took a moment to reflect..Allah is saying here that this world is a 'prison' for the believer..because..a believer can never shirk his duty. He has a responsibility to look after people, care for his children, look after his health, speak with sense, commit good deeds and keep his society from disintegrating. A believer cannot just walk away and let poverty, disease, etc take over the world, he HAS to care about the rest of humanity. So yes, it is logical.