Speculative reason

Definition and stakes

Portrait of William Whewell William Whewell,  History of the inductive sciences… (1875)

“ It is this speculative tendency which brings to light the difference of common Notions and scientific Ideas, of which we have spoken. The mind analyzes such Notions, reasons upon them, combines and connects them; for it feels assured that intellectual things ought to be able to bear such handling. Even practical knowledge, we see clearly, is not possible without the use of the reason; and the speculative reason is only the reason satisfying itself of its own consistency. The speculative faculty cannot be controlled from acting. ”
Source: Gutenberg

Portrait of F. C. S. Schiller F. C. S. Schiller,  Personal Idealism — Essay IIAxioms as Postulates (1902)

“ Thus the speculations to which we were first driven in the hungry teeth of savage facts by the slender hope of profit, by the overpowering fear of the ruin which stared us in the face, have slowly ceased to be speculative and become the foundations of the ordinary everyday business of life. Our postulates have grown respectable, and are now entitled axioms. ”
Source: Wikisource

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