Metaphysics is a difficult branch of Philosophy, but is rather easy to define: It is the study of the most fundamental concepts and beliefs about them. Examples of metaphysical concepts are Being, Existence, Purpose, Universals, Property, Relation, Causality, Space, Time, Event, and...

Immanuel Kant (22 Apr 1724 - 12 Feb 1804) was a Prussian (German) philosopher, generally regarded as the most major figure in Modern Philosophy, put alongside Plato and Aristotle from Ancient Philosophy. This makes Kant one of history’s most influential thinkers. Known for his highly articulated...

Gottfried Wilhelm von Leibniz (1 Jul 1646 - 14 Nov 1716) was a German philosopher and mathematician, writing primarily in Latin and French, who, independently of Newton, invented Calculus, invented the Binary_Number_System, and was a contributor to a vast array of subjects, including Philosophy, Physics, Technology,...

Baruch Benedict de Spinoza (24 Nov 1632 - 21 Feb 1677) was a Dutch philosopher of a Portuguese Jewish family, whose controversial metaphysical ideas led to cherem (removal) against him from Jewish Society, and his works were banned by the Vatican. Despite his considerable scientific aptitude, the breadth and importance of Spinoza’s work was...

George Berkeley (12 Mar 1685 - 14 Jan 1753, and pronounced: “Barkly”) was an Anglo-Irish philosopher who advanced a theory of “Immaterialism” and was known as the good “Bishop Berkeley”. Seen as a poweful “subjective idealism”, Berkeley argued we can directly know only our own Sensation and Idea of an Object. The notion of “matter”, for example, is an idea dependent upon being...

Plato (428-27 - 348-47 BC) was a major Greek thinker in Ancient Philosophy, a student of Socrates, founder of the first Academy, and with his student Aristotle and the most important modern philosopher Kant, is still considered one of the singularly important thinkers of all...

Aristotle (384-322 BC) was a major Greek thinker in Ancient Philosophy, a student of Plato (who was student of Socrates) and a teacher of Alexander the Great. Aristotle was the first to treat many of the subjects we know separately, from Metaphysics, Logic and Physics to Ethics, Poetics, Politics and...

René Descartes (31 Mar 1596 - 11 Feb 1650), also known as Renatus Cartesius and dubbed “Father of Modern Philosophy”, was a French philosopher crucial to Western Philosophy in the fields of Metaphysics and Philosophy of Mind, and he was a key figure, with Francis Bacon and others, in the Scientific Revolution. Descartes’ Meditations on First Philosophy (1642) has...

Thomas Hobbes (5 Apr 1588 - 4 Dec 1679) was an English political_philosopher, most famous for his book Leviathan (1651), and his view of a “state of nature” to avoid, a life “brutish, nasty and short”. His view of the necessity of a powerful central Government, where some may be stronger or more intelligent than others, but none are beyond fear of another doing harm to them. ...

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