Do they not see what is before them and what is behind them of the heavens and the earth and contemplate their existence, maintenance and conservation. If We willed We could eclipse them in one swallow by a yawning earthly chasm We create beneath them or cause a piece of heaven to fall upon them in the form of discs of cumuli; either incident is by itself a great inducement for lifting to Allah the inward sight by the votary devoted to religious observances and to repentance with a breast filled with reverential awe.