The Command to reflect upon the Qur'an

Commanding the people to reflect and ponder upon the Qur'an, and prohibiting them from turning away from it, Allah says,

أَفَلاَ يَتَدَبَّرُونَ الْقُرْءَانَ أَمْ عَلَى قُلُوبٍ أَقْفَالُهَآ

أَمْ عَلَىٰ قُلُوبٍ أَقْفَالُهَا (or do they have locks on their hearts? - 47:24) The meaning of this phrase is synonymous with similar phrases in other verses of the Qur'an where words like khatm or tab' "[ Allah ] has set a seal [ on their hearts ] have been used to describe how the disbelievers refuse to employ their hearts for the comprehension of truth, as a natural consequence their capacities to distinguish right from wrong have become atrophied. Carelessly, committing sins all the time is the main cause of this. Allah forbid!