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
(Will they not then reflect upon the Qur'an, or are there locks upon their hearts) means, there indeed are locks upon some hearts, firmly closing them so that none of its meanings can reach them. Ibn Jarir recorded from Hisham bin `Urwah, from his father, may Allah be pleased with him, that Allah's Messenger ﷺ once recited this Ayah,
أَفَلاَ يَتَدَبَّرُونَ الْقُرْءَانَ أَمْ عَلَى قُلُوبٍ أَقْفَالُهَآ
(Will they not then reflect upon the Qur'an, or are there locks upon their hearts) and a young man from Yemen said, "Indeed, there are locks upon them -- until Allah opens them totally or slightly." After that `Umar, may Allah be pleased with him, always liked that young man, and kept that to himself until he became in charge, upon which he utilized him (as a consultant).
Continue reading the tafsir of ayahs 24–28 الشَّيْطَانُ سَوَّلَ لَهُمْ وَأَمْلَىٰ لَهُمْ (it is Satan who has tempted them and involved them in far-fetched fancies. - 47:25). In this sentence, two acts have been ascribed to the devil: - taswil [ meaning the act of decking out evil works fair to some people, and imla' meaning the act of giving respite. First, he made their evil works look good and beautiful to them, and then prolonged their false hopes which will never be fulfilled.
The Quran is a book of guidance. But in order to have the benefit of it, it is necessary for the reader to be serious about it. If some improper feeling makes him flippant about it, he can never avail of the counsel offered, even although it has been presented in the best possible manner. If any commandment of religion is issued by which an individual is required to sacrifice his desires and interests, Satan immediately gives him some excuse not to do so, and since the present world is a trial ground for mankind, he has the opportunity to make use of this lame excuse. But this holds only for a very short time. When death strikes, the whole position will be entirely different.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.