On Dhikr

أَلَمْ يَأْنِ لِلَّذِينَ آمَنُوا أَنْ تَخْشَعَ قُلُوبُهُمْ لِذِكْرِ اللَّهِ وَمَا نَزَلَ مِنَ الْحَقِّ

Is it not time that the hearts of the believers be humbled to the Remembrance of Allah and the truth which He has sent down?

(al-Hadid: 16)