Meanwhile, the following considerations may be offered in its favour: Logic states, and partly explains and applies, certain abstract principles which all other sciences take for granted; namely, the axioms above mentioned--the principles of Contradiction, of the Syllogism and of Causation.

By exercising the student in the apprehension of these truths, and in the application of them to particular propositions, it educates the power of abstract thought.

Every science is a model of method, a discipline in close and consecutive thinking; and this merit Logic ought to possess in a high degree.
For ages Logic has served as an introduction to Philosophy that is, to Metaphysics and speculative Ethics.

It is of old and honourable descent: a man studies Logic in very good company.

It is the warp upon which nearly the whole web of ancient, mediaeval and modern Philosophy is woven.