@Aedes,
Aedes wrote:You might argue that deeper down everything we consciously do requires absolute confidence in our existence. But since we seldom think about this issue, I'm not sure that that argument really holds -- we do a lot of things in life without ever pondering our existence.
Yes, in short that is my argument. And this confidence over-rules any intellectual arguments, because they require consious action (thought), which is based on this confidence.
If a person is completely unable, even theoretically, to act contrary to a certain belief, then I would call that person absolutely certain of that belief.