Something can be wishful thinking and true at the same time. Doing the sum wouldn't prove that it's not wishful thinking.
Of course having the sum be correct is a necessary condition for non-wishful thinking, but it does not determine the existence of non-wishful-thinking all by itself.
Of course having the sum be correct is a necessary condition for non-wishful thinking,...
No it's not. You can be wrong for reasons other than wishful thinking.
Another month, another rationality quotes thread. The rules are: