What is the end to men's lives? There are two parts to men's lives: the part here on earth, and the part in the Hereafter. The dividing line between the two is known as death, followed by the Day of Judgement or Resurrection. As far as death is concerned, everyone must go through it, but on Judgement Day people will be sorted out from each other into different categories,
"Every human being is bound to taste death: but only on the Day of Resurrection will you be requited in full [for what you have done]..." [Qur'an 3:185]
Resurrection Day will actually be a huge period of time (not a regular 24-hour day) in which every single human will be resurrected and judged by God on his or her beliefs and deeds. No human being - not even any Prophet - knows when this Day will come, for this is knowledge known only to God. The Final Book does describe it in several passages as a giant disaster on many scales (physical and ecological among others), and the Last Messenger was told of some of its foreshadowing signs, which he communicated, to us.
"For People Who Think"
Some people reject God because they can find no evidence for Him, which satisfies both their hearts and minds simultaneously. Then there are others who accept God on the basis of emotional or irrational reasons, which satisfy their hearts, but leave their minds unsure. These two groups of people have never found a satisfying answer to the question of their relationship with God. Then there are yet others who have found the correct path which God intended for us: to accept Him and His message to us using our minds first and foremost, and the heart follows easily and naturally as a consequence.
Instead of searching for the answer, there are also some people who chose to simply brush the question aside and ignore it unfortunately. This is the easy way out of what appears to be a very difficult, mysterious question which may seem to have no final solution. Most of these people are unaware of a very powerful message, which completely and unequivocally establishes the correct path to God. This message squares with both the mind and the heart, and it has no equal since it comes to us straight from God Himself.
The message comes in the form of a book. In fact, God has given us several Books of guidance through the years, but each one was ultimately corrupted and changed by dishonest people. Each Book essentially contained the same fundamental message as the previous Books. Mankind was expected to guard these Books from harm, but unfortunately failed to live up to this expectation. Slowly but surely, each Book was edited and tampered with, destroying its authenticity. This is partly why God kept sending us more revelations.
However, almost 1400 years ago, God sent us another Book with the same basic message as the earlier ones, but with a small but very important difference. This time, God decreed that this Book would be the last Book sent down to us because God would protect it Himself. Regarding this Final Book, God said,
"Behold, it is We Ourselves who have bestowed from on high this reminder: and behold, it is We who shall truly guard it" [Qur'an 15: 9]
Today, if we compare the 114 chapters in every copy of this Final Book with each other, we will find they match perfectly word for word - from the oldest copies made 1400-plus years ago to the ones printed just a few hours ago. No human hand has changed it.
The rational person has every right to be doubtful, of course, if he or she has never read this book. For such people, here is a small sample of what the Final Book contains. Suppose we wanted to ask God several questions about Him and about ourselves. Short of Him speaking to us directly (such a privilege has been granted to only one person out of all humanity), the Book has the best answers one can find. It is on the strength of these answers that an honest person may be struck with the conviction that the Final Book is from none other than God Almighty. Again, here is only a small part of the information one might find.