Philosophy has three primary dimensions.

To outline the history of philosophy, we must understand what it is – how it works, and what it seeks to achieve. 

So, what is philosophy?

Unfortunately, there’s no universally accepted definition – philosophers are a notoriously opinionated and argumentative group. But we can arrive at a satisfactory description with a bit of thought.

To begin with, humans are, in philosophical language, finite beings: mortal creatures occupying a limited patch of space and time. And, unlike other animals, we’re aware of these limits. A dog or lion, for instance, has no advance knowledge of their death. They’re only concerned with the present moment. But humans live knowing that they – and their loved ones – will inevitably die. 

This shadow of death forces us to contemplate what to do with our fleeting time on Earth. It also instills us with deep terror – fear of losing loved ones, fear of the unknown, fear of nothingness.

This angst prevents us from living a wholly contented life, full of love and satisfaction. And from the start, philosophy and religion have tried to help us conquer this fear – but they go about it in entirely different ways.

Religion – and particularly Christianity – promises to save us from the fear of death through faith. If we have faith in God, He will save us by admitting us into heaven, where we’ll reunite with our loved ones for eternity.

Philosophy, on the other hand, promises to save us by using our own logic and reasoning. By trying to understand ourselves, other people and the world we inhabit, philosophy hopes to conquer the anxiety surrounding death.

Toward this end, philosophical thinking comprises three stages.

First is theory. This involves thinking deeply about the nature of reality. But our knowledge of reality is filtered through the tools we use to comprehend it, and so theory studies those tools too. How do we pinpoint the causes of natural phenomena? What are the ways through which we can establish a statement as “true?” These questions make up the second part of theory.

Second is ethics. This is more practical and studies humanity. In particular, it asks how we should behave and coexist with one another. 

Third is wisdom or salvation. This is the ultimate goal of religion and philosophy and asks what – if any – meaning there is to life, and how we can live a fulfilled life free from the suffocating fear of our mortality.

And one of the first philosophies to utilize this three-stage system was Stoicism.