Logic should no longer be considered an elegant and learned accomplishment; it should take its place as an indispensable study for every well-informe… - William Stanley Jevons

The whole result of continued labour is not often consumed and enjoyed in a moment; the result generally lasts for a certain length of time. We must then conceive the capital as being progressively uninvested.

I shall endeavor to show that induction is really the inverse process of deduction.

Neither in deductive nor inductive reasoning can we add a tittle to our implicit knowledge, which is like that contained in an unread book or a sealed letter. ...Reasoning explicates or brings to conscious possession what was before unconscious. It does not create, nor does it destroy, but it transmutes and throws the same matter into a new form.