What are the facts?
Again and again and again--what are the facts?
Shun wishful thinking,
ignore divine revelation,
forget what 'the stars foretell,'
care not what the neighbors think,
never mind the unguessable 'verdict of history,'
--what are the facts, and to how many decimal places?
You pilot always into an unknown future; facts are your only clue.
Get the facts!
-- Lazarus Long
-- Robert A. Heinlein