Here's what we can summarize as his core principles:
* The pursuit of knowledge: Socrates believed that the most important thing in life was the pursuit of knowledge and understanding. He famously said, "The unexamined life is not worth living."
* Self-knowledge: Socrates believed that the first step towards wisdom was knowing oneself. He believed that most people lived their lives without truly understanding themselves or their own values.
* The Socratic method: This is a method of questioning that aims to uncover hidden assumptions and contradictions in people's beliefs. By asking a series of probing questions, Socrates could help individuals to see their own flaws in thinking and arrive at a more accurate understanding of the world.
* Moral responsibility: Socrates believed that everyone had a moral responsibility to live a virtuous life. He argued that virtue was its own reward, and that true happiness came from living a life that was consistent with one's values.
While he didn't write anything down, his teachings were passed down through his student, Plato, who wrote about Socrates's ideas and dialogues.
So, while Socrates didn't have a "creed" in the traditional sense, he did have a strong set of beliefs and values that guided his life and his philosophy.