If a group of people are asked what the most important issue for mankind is today, different people will have different answers. Some would say the spread of nuclear weapons, some, the population explosion, while others might say that the production and distribution of wealth are of paramount importance. In the book, Man Know Thyself, Maulana Wahiduddin Khan explains that we are perpetually facing a peril much greater than this, yet no one feels the need to become anxious about it. It is the peril of the Last Day which has been destined for the world since the creation of the universe and towards which we are careering at a reckless speed. The book explains the reality of life and how man can prepare for this eventual peril.