The Syllogism consists of propositions, propositions consist of words, words are symbols of notions. Therefore if the notions themselves (which is the root of the matter) are confused and over-hastily abstracted from the facts, there can be no firmness in the superstructure. Our only hope therefore lies in a true induction.

The New Organon (1620) in James Spedding, Robert Ellis and Douglas Heath (eds.), The Works of Francis Bacon (1887–1901), Vol. 4