“The issue of the heart is not a matter of play, for it can be ruined in an instant but take lifetime to revive and rectify just like the making or rebuilding of a town. We should all strive our hardest to rectify our hearts and make them thriving communities.” –

Rectifying the Heart – Shaykh Zulfiqar Ahmad

http://www.tasawwuf.org/writings/sermons/khutbat_fivev1.htm