Is the phrase "Iblis's dream in Paradise" correct?

The phrase "Iblis's dream of Paradise" is said to someone who asks for the impossible, and it is intended to make him despair of the possibility of attaining his request, just as it is impossible for Iblis to enter Paradise. There appears to be no impediment to using it in this context as a measurement and example, but caution must be exercised so that it is not used to restrict God's mercy or to make a disobedient person despair.