An Interesting Quote

I was reading the book Freefall by Joseph E. Stiglitz (Nobel Prize winner in Economics)and came across the following words:

"Quite often in science certain assumptions we so strongly hold or are so ingrained in the thinking that no one realize they are only assumptions." (p. 242)

I've been thinking of that idea more broadly for quite a while. In fact, I'm becoming more and more very suspicious of "conventional wisdom" because the foundation for that "wisdom" many times is nothing but assumptions.