The Commens Dictionary
Quote from ‘Adirondack Summer School Lectures’
Logic […] is but an application of ethics to thought. For reasoning differs from the formation of a new belief by the action of the association of ideas only be being a deliberate, controlled piece of conduct.
However, the one sole way to success in logic is to regard it as a science of signs; and I defined it in 1867 as the theory of the relation of symbols to their objects. Further experience has convinced me that the best plan is to consider logic as embracing more than that, and the general theory of signs of all kinds, not merely in their relation to their objects but in every way.
This way of looking upon logic is the one salvation for the science.