At least every now and then, we should provide the evidence and let the reader draw his or her own conclusion. This converts obedient assimilation of new knowledge into personal discovery. When you make the finding yourself -- even if you're the last person on Earth to see the light -- you never forget it.
-- Carl Sagan,
"No Such Thing as a Dumb Question,"
The Demon-Haunted World
I have steadily endeavoured to keep my mind free so to give up any hypothesis, however much beloved (and I cannot resist forming one on every subject), as soon as facts are shown to be opposed to it.
-- Charles Darwin
There is no prescribed route to follow to arrive at a new idea. You have to make the intuitive leap. But the difference is that once you've made that intuitive leap you have to justify it by filling in the intermediate steps.
-- Stephen Hawking