Here is a fun little article by Ralph McInerny on how the best thought begins by thinking with someone else. He mocks (rightly I think) the Enlightenment notion that to ‘accept anything on anyone else’s say-so’ is practially ‘immoral’.
For my part, I have no trouble accepting things because other people think them (I am Catholic after all!). In fact, as I grow older and less and less sure of my own capabilities, I am coming to see my thinking as more and more dependent on the masters from whom I have learned (both my ‘local masters’ like Kreeft, Schrag, and Lawrence but also my real masters like Aquinas, Heidegger, Aristotle, and Plato). I am more and more concerned about thinking with them rather than thinking for myself. This is why I suggested, in PHIL 3180 the other day, that I have moved almost completely past any notions of ‘authenticity’, a category that is suspiciously adolescent in its requirement that one says ‘no’ to both those whom have come before and to common sense.