This is a 4-book combo with the following topics in it: Topic 1: In this convenient guide, several ancient, famous philosophers will be covered, so you may get a better understanding of the ancestors who have shaped our ideas and theories before we were born. Topic 2: Stoicism is a concept that has been studied more and more lately. The philosophy that dates back all the way to Socrates has been significant in many people's lives. So, today, we will expand on what stoicism is, where it originated from, and how you can use it in your life to become a better person and achieve more. On top of that, we'll discuss how the Golden Rule (do unto others what you would have them do unto you) applies and is directly related to the idea of stoicism. We'll go over what is meant by "logos" and why so many businesspeople and entrepreneurs have studied stoicism to improve their responses and results to changes in the market and their negotiations. Topic 3: Skepticism is a philosophical movement that has been in existence for centuries. And even though some may call it old and outdated, studying this concept can bring enlightenment to the soul. Sometimes, being skeptical is erroneously connected to simply being negative. But this assumption is far from the truth. Topic 4: Existentialism is a basic terminology concept for theorists that think of the nature of the human condition as a fundamental essence of philosophical issues and who also share the view that this problem is best resolved through ontology. This very broad definition will be clarified by going over seven crucial themes that existentialist thinkers address.