A lot of times when one strays from God's will, it is said: "As for the unbelievers who cry lies to our signs, those shall be the inhabitants of the Fire, therein dwelling forever" (Arberry). The afterlife is referenced on almost every single page of the Qur'an, signifies the essential faith that every Muslim should have. This idea of afterlife is so important that it is often referred in conjunction with the belief in God as in the common expression: "Believe in God and the last day" (Arberry). "And if you do not (believe) and you will not -- then fear the Fire, whose fuel is men and stones, prepared for unbelievers" (Arberry). The consequences of nonbelievers and evildoers are contrasted with rewards of the believers and kind-hearted: "Whosoever follows my guidance, no fear shall be on them, neither shall they sorrow." The faithful followers will be let into heaven, living in Paradise, while the evildoers will suffer in hell for eternity. The Day of Resurrection is when the present world comes to an end and God differentiates on all mankind. It is so often mentioned in the Qur'an that it made me ponder its purpose. After carefully analyzing the text, I found that such large amount of repetition of the Day of Reconstruction and the afterlife is to constantly remind people of the consequences of evil behaviors, and to make them fear God more and be loyal servants. All men are encouraged to perform good deeds or otherwise they will suffer for the rest of their lives. According to scholars, around a full one-third of the Quran deals with the afterlife in the next world, and with the Day of Judgment at the end of time. It is also sometimes considered the second greatest doctrine of the Qur'an, after Monothesim being the number one doctrine, which I will talk about next.
Being Monothesim means believing in only one god, that is eternal, all-knowing and all-enabling.
