Surah 57. Al-Hadid, Ayah 17

According to most of the commentators - and, particularly, Zamakhshari, Razi and Ibn Kathir - this is a parabolic allusion to the effect of a re-awakening of God-consciousness in hearts that had become deadened by self-satisfaction and false pride.

 So it is easy for Him to soften your hearts as well.

As the dead earth is revived after the refreshing showers of rain, so is it with the spirit of man, whether as an individual or a race or Ummat. There is no cause for despair. Allah's Truth will revive the spiritual faculties if it is accepted with humility and zeal.