The worst mistake of first contact, made throughout history by individuals on both sides of every new encounter, has been the unfortunate habit of making assumptions. It often proved fatal. David Brin
Assumptions are the termites of relationships. I wrote that. Henry Winkler
Most of our assumptions have outlived their uselessness. Marshall McLuhan
Of all the preposterous assumptions of humanity over humanity, nothing exceeds most of the criticisms made on the habits of the poor by the well-housed, well-warmed, and well-fed. Herman Melville
Beware of assumptions that seem "obvious” in one decade. They may become quaint in the next. David Brin
Begin challenging your own assumptions. Your assumptions are your windows on the world. Scrub them off every once in while, or the light won't come in. Alan Alda