This branch of mathematics [probability] is the only one, I believe, in which good writers get results entirely erroneous - Charles Sanders Pierce
When it is said - you can't estimate the future - or we don't know total cost, think of Mr. Pierce. All things project management are probabilistic drive by the underlying statistical processes of irreducible and reducible uncertainty. Rarely, if ever, are these uncertainties Unknowable, in the mathematical sense.
