Philosophy is an endless sea. To know it, you need knowledge of what the ancients said and what the moderns mentioned. The late Professor Dr. Major Ahmed Fouad Al-Ahwani decided to add to what was found in the Arabic language about philosophy what no one else had paid attention to. Therefore, this book is a tour into the world of philosophy. In philosophy, it is difficult to agree on a single opinion. This history of philosophy before us opens its doors for the reader to see in it whatever he wants. This book introduces Greek philosophy to Orpheus and the Orphic bee, Aristophanes, the poet of comedy, and the representation of clouds, which you may not have read about before, dear reader. It also introduces the Academy or Plato's school, the Timaeus and his world, and what you did not know about Aristotle. Then the book takes us to the world of Islamic philosophy, sailing in the waves of Islamic thought, to touch the effects of that nation that changed the features of human history, and provides us with a comprehensive vision of the different cultures before Islam, then the theory of knowledge according to some Muslim philosophers. Al-Ahwani discusses Al-Ghazali and Ibn Rushd in a very special chapter. Al-Ahwani does not stop there. Rather, he takes us to the world of modern philosophy and stops at specific philosophers such as David Hume. Then he enters a new science that no one had talked about before him, which is post-psychology or metapsychism, and from there to the revolution of logic. From the above, it becomes clear to you, dear reader, that you are facing a unique book that is indispensable for lovers of philosophy, Greek, Islamic, and modern.