Inference is always an invasion of the unknown, a leap from the known.
 John Dewey, Democracy and Education (1916). copy citation

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Author John Dewey
Source Democracy and Education
Topic unknown
Date 1916
Language English
Reference
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Weblink http://www.gutenberg.org/files/852/852-h/852-h.htm

Context

“The data arouse suggestions, and only by reference to the specific data can we pass upon the appropriateness of the suggestions. But the suggestions run beyond what is, as yet, actually given in experience. They forecast possible results, things to do, not facts (things already done) . Inference is always an invasion of the unknown, a leap from the known. In this sense, a thought (what a thing suggests but is not as it is presented) is creative,—an incursion into the novel. It involves some inventiveness. What is suggested must, indeed, be familiar in some context;” source