2 Preface كِتابٌ أُنزِلَ إِلَيكَ فَلا يَكُن في صَدرِكَ حَرَجٌ مِنهُ لِتُنذِرَ بِهِ وَذِكرىٰ لِلمُؤمِنينَYusuf AliA Book revealed unto thee,- So let thy heart be oppressed1 no more by any difficulty on that account,- that with it thou mightest warn (the erring) and teach the Believers)###.Heart in the original, breast. I have used the word most appropriate to the English idiom. The meaning is that Al Muṣṭafā is consoled for all the difficulties which he encountered in his mission, with the fact that he had clear guidance in the Book for his preaching.