Imam Ali (AS) said, Safety in this world is not acquired except by its renunciation. People are tested in it through tribulations so those who have taken from it for its sake will be removed from it [by death] and will be made accountable for it. And whatever they have taken from it for the other world, they will go to it and will stay in it. For the wise one this world is like a shade – at one moment it expands until [the next moment] it shrinks and extends until it diminishes. And Allah has left you with no excuse by forbidding from it, and he has warned and cautioned you about it – so He has apprised you of it.