Verily, We have sent it down as an Arabic Quran in order that you may understand. Relate not your vision to your brothers, lest they arrange a plot against you.
Shaitan is to man an open enemy.
Chapter Yusuf is the longest story of a single person in the Quran. The story starts in aayah 4 and ends in verse 102. Muslim scholars have several opinions about the interpretations on the abbreviated letters mentioned in the beginning of this Surah and several other Surahs. The general consensus among them was that these letters are one of the miracles of the Quran. It is a challenge from Allah to mankind to produce a single verse like those of the Quran.