These are the Verses of the Clear Book. Verily, We have sent it down as an Arabic Qur’an in order that you may understand

 Allaah (The Most High) said:

الٓر‌ۚ تِلۡكَ ءَايَـٰتُ ٱلۡكِتَـٰبِ ٱلۡمُبِينِ

إِنَّآ أَنزَلۡنَـٰهُ قُرۡءَٲنًا عَرَبِيًّ۬ا لَّعَلَّكُمۡ تَعۡقِلُونَ

Alif-Lam-Ra.These are the Verses of the Clear Book. Verily, We have sent it down as an Arabic Qur’an in order that you may understand. [12:1-2]

Allaah (The Most high) informed (us) that the verses of the Qur’aan are clear; meaning: Its wordings and meanings are manifest and clear. And from its manifest and clear (nature) is that it has been sent down in the Arabic Language—the noblest and most (precise and eloquent of all languages in giving clarification, explanation etc). And all this clarity and explanation is so that لَّعَلَّكُمۡ تَعۡقِلُون — ‘’You may understand’’; meaning: so that you may understand its prescribed boundaries (in punishments, retribution, acts of worship, dealings etc); its fundamental principles; its subsidiary issues; its commandments and prohibitions. So when you understand it (after studying, contemplating etc) and your hearts become characterized with its understanding, then that will produce the fruits of actions of the limbs and submission to it. And لَّعَلَّكُمۡ تَعۡقِلُون – ‘’In order that you may understand’’; meaning: Your intellects are enhanced by way of affirming the noble and lofty meaning (of affairs) in your minds; so you move from one state to another loftier and more perfect state. [1]

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[1] [Slightly paraphrased. See ‘Tayseer Al-Kareem Ar-Rahmaan Fee Tafseer kalaam Al-Mannaan’ of Imaam Sadi (rahimahullaah)