You know more of a road by having traveled it than by all the conjectures and descriptions in the world. William Hazlitt
There is something fascinating about science. One gets such wholesome returns of conjectures out of such trifling investment of fact. Mark Twain
It is clear that there is no classification of the Universe that is not arbitrary and full of conjectures. The reason for this is very simple: we do not know what kind of thing the universe is. Jorge Luis Borges
You should look at all the experimental information at hand, not only the most relevant, and be prepared to make conjectures if that helps. Hans Bethe
Our conjectures pass upon us for truths; we will know what we do not know, and often, what we cannot know: so mortifying to our pride is the base suspicion of ignorance. Philip Stanhope, 4th Earl of Chesterfield
Other people do not see you at all, but guess at you by uncertain conjectures. Michel de Montaigne