Existence is the knowing of changes, no one at any point can deny their existence, it is certain and unchanging and the movement of changes only appear on this perfectly fine background. The mind appears therefore to be the wrong tool to identify what is currently always present.
Existence is present and the mind’s figurings are just another movement which will occasionally dance here. What you really are has no problems.
The natural appearance of thought doesn’t change what you always have and will be one bit, just for a moment, don’t think, just look.