Translation of the verse 23 from Surah Az-Zumar : Number of verses 75 - - page 461 - Part 23.
Allah has sent down the best statement, a Book (this Quran), its parts resembling each other in goodness and truth, oft-repeated. The skins of those who fear their Lord shiver from it (when they recite it or hear it). Then their skin and their heart soften to the remembrance of Allah. That is the guidance of Allah. He Guides therewith whom He pleases and whomever Allah sends astray, for him there is no guide.
Allah has sent down the best statement: a consistent Book wherein is reiteration. The skins shiver therefrom of those who fear their Lord; then their skins and their hearts relax at the remembrance of Allah. That is the guidance of Allah by which He guides whom He wills. And one whom Allah leaves astray - for him there is no guide.
(39:23) Allah has revealed the best teaching, a self-consistent Book *43 which repeats its contents in manifold forms whereat shiver the skins of those that hold their Lord in awe, and then their skins and their hearts soften for Allah's remembrance. That is Allah's Guidance wherewith He guides whosoever He pleases. And he whom Allah does not guide to the Right Path has none to guide him.
*43) That is, there is no contradiction and disagreement between them. The whole Book, from the beginning to the end, projects one and the same aim, one and the same belief, and one and the same system of thought and action. Each of its parts confirms and supports and explains the other themes; and there is perfect consistency in it both in meaning and in style.