The science of correct thinking

From the author's introduction (italics his): "Truth is the object of thinking. Some truths are obvious; others are difficult of attainment. Correct thinking is a prime necessity in the solution of complicated problems, and logic enables us to think correctly. Logic *is the science of those principles, laws and methods which the mind of man in its thinking must follow for the accurate and secure attainment of truth*. Ordinary man has natural logic or common sense. *Scientific* logic is natural logic trained and developed to expertness. Logic as a *science* consists of a comprehensive body of established principles and laws with their legitimate conclusions; logic as an *art* is the mastery if the technique embodied in these principles and laws. *Ideas, judgments, and inferences* are the elements which enter into the operations of the mind in its attainment of truth. Scientific *methods* are also of importance for this purpose. Hence, logic will treat of ideas, judgments, deductive and inductive inferences. "