Deists living during the European enlightenment believed that humans can only know god through the observance of the natural world and reason, not through miracles or revelations.
What it is saying is it is like having a peanut butter jelly sandwich without the bread. It is ridiculous and something that is needed to make a whole of something. So like per say, you have a teddy bear but you buy that teddy bear but it has no filling in it. So it's like claiming to be a car salesman, without the cars. I hope this helps, sorry if it doesn't make sense.
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