What is the effect of the Holy Quran on a Muslim's words and actions, and what is the recompense for whoever follows its rulings and the commands and prohibitions contained therein?

If a Muslim follows the Holy Quran, this will have the greatest impact on his words, deeds, and ultimate destiny, because the Quran guides to that which is most upright. So, whoever is guided by it will be the most complete, most upright, and most guided of people in all matters; he will only say what is best, only do what is best, and only believe what is true. Consequently, fear, sorrow, misguidance, and misery will be dispelled from him in this world and the Hereafter, and he will attain security, happiness, and a good life.