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This verse highlights the greatness of the Companions who were taught the Book, taught wisdom, and were purified by the Prophet صَلَّى الـلّٰـهُ عَلَيْهِ وَاٰلِهٖ وَسَلَّم. Furthermore, we learn that the entire Quran is not easy to understand, otherwise, the Beloved Prophet صَلَّى الـلّٰـهُ عَلَيْهِ وَاٰلِهٖ وَسَلَّم would not have been sent to teach it. Anyone who says that the Quran is easy to understand should be taken to an expert scholar, the reality will become apparent within minutes.  It is also clear from this that hadith are needed with the Quran.