Philosophical theories are theories that are philosophical, rather than purely scientific by nature. Meanwhile, philosophical concepts can be loosely describes as ideas or “concepts” that are philosophical in nature.

Generally, a concept is a single idea, a theory is an explanation of how something works, and philosophy is simply the study of that which we can’t know for sure (see the branches of philosophy.).

So then, for our purposes, philosophical theories and concepts is simply a broad category that contains all non-scientific theories worth discussing.

TIP: For a great explainer on the basics of Philosophy see Tamar Gendler: An Introduction to the Philosophy of Politics and Economics by Big Think.

NOTE: Some scientific theories that spark metaphysical philosophical questions are categorized here (as well as under their respective scientific fields). Learn more about scientific theories.

Potentially, Everything is Light


Nikola Tesla was said to have said “everything is light.” That is potentially correct. In theory, the universe could be explained by electromagnetic energy.

You Can’t Prove a Negative


The saying “you can’t prove a negative” isn’t accurate. Proving negatives is a foundational aspect of logic (ex. the law of contradiction).

There is No Such Thing as Objective Truth


What is Truth?

The idea that all truth is subjective, that there is no objective truth, is a myth. Everything either has an absolute truth value (even if we can’t know it) or is an opinion or belief.