“We set up assumptions, based upon our best knowledge, but can go no further.”- Elder John A. Widtsoe, Evidences and Reconciliations, 126.
Widtsoe was a European, a Harvard grad, a scientist, and an Apostle, a unique combination I don’t believe has been duplicated since. (President Eyring comes close, although New Jersey, a foreign country to many of us, isn’t technically in Europe.)
Widtsoe makes this statement in context of thinking about the Flood. What I find striking about it is how rarely we find recognition in Apostolic or official LDS discourse about the limits of our revealed knowledge and the assumptions that we all make.