Tafseer Ibn Kathir of AL AN'AAM [105]

وَكَذَلِكَ نُصَرِّفُ الآيَاتِ وَلِيَقُولُواْ دَرَسْتَ وَلِنُبَيِّنَهُ لِقَوْمٍ يَعْلَمُونَ

And thus do We diversify the verses so the disbelievers will say, "You have studied," and so We may make the Qur'an clear for a people who know.