system
Given the following post, respond as if you're commenting on Reddit:
human
A Question about Bergson

In his *Introduction to Metaphysics*, Bergson wrote that "This reality is mobility". To which he added in a footnote:-


> Let me insist I am thereby in no way setting aside substance. On the contrary, I affirm the persistance of existences. And I believe I have facilitated their representation. How was it ever possible to compare this doctrine with the doctrine of Heraclitus?


My questions are:-


1. What is the "doctrine of Heraclitus" and how is it different from the "doctrine" of Bergson?



2. What does this footnote mean?


Thank you for reading!
gpt
The doctrine of Heraclitus is that everything is moving and thus all things must exist or be the same throughout their existence and non-existence. 

I think the footnote is probably some sort of common ground for him to explain where his work stands (to give the reader a point of reference). But he's also specifying that his insisting on movement and mobility is not discarding substance and the persistence of past substance over time, which is a pretty big point for his philosophy.