Descartes Discourse on Methods Part 4

In part four Descartes mentions that the we should not judge that the sun is as large as we see it. I think that he brings up this example to make a point about perception and our beliefs because of perception. Like just because the sun looks a certain size does not mean it is the size we perceive it as. I think this can be related to God because although we can not see him at all does not mean that he does not exist. In my opinion, this has to do with perception because perception is how we see things and since we can not see God at all, some might percieve him as not being existent. Therefore, Descartes is telling us to not judge things mainly on perception because God does exist.