We only have fragments of his work:
* Fragments: These are short snippets of his writings, often consisting of only a few lines or even just a single sentence. These fragments are scattered throughout the works of other ancient Greek writers.
* "On Nature": The title "On Nature" is traditionally attributed to Heraclitus' work, though it's uncertain if he actually used that title. However, many of the surviving fragments are believed to come from this work.
Key Challenges in Studying Heraclitus:
* Authenticity: Not all fragments can be confidently attributed to Heraclitus, making it difficult to get a clear picture of his full teachings.
* Interpretation: Even with the surviving fragments, there is significant debate among scholars about the true meaning of his words.
Overall: It's important to understand that we don't have a complete work from Heraclitus, but rather a collection of fragments that provide glimpses into his thoughts and philosophy.