The history made by the prophets in ancient times is an eternal source of admonition. For example, prophets appeared among the ‘Ad, the Thamud, the people of Madyan, and the community of Lot. These prophets did not possess any supernatural powers to prove their veracity. They had only reasoning in their favour. Rejection of the Truth in spite of its being backed by reasoning made the doubters liable for punishment. This shows that in this world a man is tested by his ability to recognise the Truth on the basis of reasoning. One who fails to do so will always remain deprived of the Truth.