Full Idea
Without the law of excluded middle, we could not ask the questions that give rise to discoveries.
Gist of Idea
Questions wouldn't lead anywhere without the law of excluded middle
Source
Bertrand Russell (An Inquiry into Meaning and Truth [1940], c.p.88)
Book Reference
'Readings on Logic', ed/tr. Copi,I. /Gould,J. [Macmillan 1964], p.185