(quote from RealReality.org/Real_Faith_and_Reason_Vol_2_-_Scientia.pdf)

But the question is whether we can use assumptions as a way of knowing. And we can’t. We try to avoid assuming because assuming is making up stuff and pretending what we made up is real. A chain of thought or a line of reasoning is only as strong as the weakest link. And assumptions are the weakest link we can get. But, we sometimes base our thinking on assumptions even though we try to avoid assuming. Because of the deceptive nature of worldviews from which assumptions come, we often don’t realize we’re assuming.

(end quote)