10 Preface وَتَسيرُ الجِبالُ سَيرًاYusuf AliAnd the mountains will fly hither and thither.1(2) The mountains are a type of firmness and stability. But things that we think of as firm and stable in this material life will be shaken to pieces, and will be no more substantial than a mirage in a desert. Cf. 78:20.