In theory, there is no difference between theory and practice. But, in practice, there is.
Speculative reason or pure reason is theoretical (or logical, deductive) thought (sometimes called theoretical reason), as opposed to practical (active, willing) thought. Jan L A van de Snepscheut (1953-1994 was a Computer scientist and Educator. The distinction between the two goes at least as far back as the ancient Greek philosophers, such as Plato and Aristotle, who distinguished between theory (theoria, or a wide, bird's eye view of a topic, or clear vision of its structure) and practice (praxis), as well as productive knowledge (techne). Biography Early life Birth and family Plato was born in Athens Greece Aristotle (Greek Aristotélēs) (384 BC – 322 BC was a Greek philosopher a student of Plato and teacher of Alexander the Great. The word theory has many distinct meanings in different fields of Knowledge, depending on their methodologies and the context of discussion.
Speculative reason is contemplative, detached, and certain, whereas practical reason is engaged, involved, active, and dependent upon the specifics of the situation. In Philosophy, practical reason is the use of Reason to decide how to act. Speculative reason provides the universal, necessary principles of logic, such as the principle of contradiction, which must apply everywhere, regardless of the specifics of the situation. Logic is the study of the principles of valid demonstration and Inference. In Classical logic, a contradiction consists of a logical incompatibility between two or more Propositions It occurs when the propositions taken together yield
Practical reason, on the other hand, is the power of the mind engaged in deciding what to do. In Philosophy, practical reason is the use of Reason to decide how to act. It is also referred to as moral reason, because it involves action, decision, and particulars. In Philosophy, practical reason is the use of Reason to decide how to act. Though many other thinkers have erected systems based on the distinction, two important later thinkers who have done so are Aquinas (who follows Aristotle in many respects) and Kant. Immanuel Kant (ɪmanuəl kant 22 April 1724 12 February 1804 was an 18th-century German Philosopher from the Prussian city of Königsberg