In philosophy, essence is the attribute or set of attributes that make an entity or substance what it fundamentally is, and which it has by necessity, and without which it loses its identity. Essence is contrasted with accident: a property that the entity or substance has contingency, without which the substance can still retain its identity. The concept originates with Aristotle, who used the Greek expression to ti ên einai  or sometimes the shorter phrase to ti esti  for the same idea. This phrase presented such difficulties for its Latin translators that they coined the word essentia  to represent the whole expression. For Aristotle and his scholastic followers, the notion of essence is closely linked to that of definition .
In the history of western thought, essence has often served as a vehicle for doctrines that tend to individuate different forms of existence as well as different identity conditions for objects and properties; in this eminently logical meaning, the concept has given a strong theoretical and common-sense basis to the whole family of logical theories based on the "possible worlds" analogy set up by Leibniz and developed in the intensional logic from Carnap to Kripke, which was later challenged by "extensionalist" philosophers such as Quine.
Ontological status
In his dialogues Plato suggests that concrete beings acquire their essence through their relations to "Forms"abstract universals logically or ontologically separate from the objects of sense perception. These Forms are often put forth as the models or paradigms of which sensible things are "copies". When used in this sense, the word form is often capitalized. Sensible bodies are in constant flux and imperfect and hence, by Plato's reckoning, less real than the Forms which are eternal, unchanging and complete. Typical examples of Forms given by Plato are largeness, smallness, equality, unity, goodness, beauty and justice.
Aristotle moves the Forms of Plato to the nucleus of the individual thing, which is called ousía or substance. Essence is the tí of the thing, the to tí en einai. Essence corresponds to the ousia's definition; essence is a real and physical aspect of the ousia .
According to nominalists, universals aren't concrete entities, just voice's sounds; there are only individuals: "nam cum habeat eorum sententia nihil esse praeter individuum " . Universals are words that can to call several individuals; for example the word "homo". Therefore a universal is reduced to a sound's emission .
According to Edmund Husserl essence is ideal. However, ideal means that essence is the intentional object of the conscience. Essence is interpreted as sense .
Existentialism
Existentialism was coined by Jean-Paul Sartre's statement that for human beings "existence precedes essence." In as much as "essence" is a cornerstone of all metaphysical philosophy and of Rationalism, Sartre's statement was a repudiation of the philosophical system that had come before him . Instead of "is-ness" generating "actuality," he argued that existence and actuality come first, and the essence is derived afterward. For Kierkegaard, it is the individual person who is the supreme moral entity, and the personal, subjective aspects of human life that are the most important; also, for Kierkegaard all of this had religious implications.
In metaphysics
"Essence," in metaphysics, is often synonymous with the soul, and some existentialists argue that individuals gain their souls and spirits after they exist, that they develop their souls and spirits during their lifetimes. For Kierkegaard, however, the emphasis was upon essence as "nature." For him, there is no such thing as "human nature" that determines how a human will behave or what a human will be. First, he or she exists, and then comes attribute. Jean-Paul Sartre's more materialist and skeptical existentialism furthered this existentialist tenet by flatly refuting any metaphysical essence, any soul, and arguing instead that there is merely existence, with attributes as essence.
Thus, in existentialist discourse, essence can refer to physical aspect or attribute to the ongoing being of a person, or to the infinite inbound within the human, depending upon the type of existentialist discourse.
Marxism's essentialism
Karl Marx was a follower of Hegel's thought, and he, too, developed a philosophy in reaction to his master. In his early work, Marx used Aristotelian style teleology and derived a concept of humanity's essential nature. Marx's Economic and Philosophical Manuscripts of 1844 describe a theory of alienation based on human existence being completely different from human essence. Marx said human nature was social, and that humanity had the distinct essence of free activity and conscious thought.
Some scholars, such as Philip Kain, have argued that Marx abandoned the idea of a human essence, but many other scholars point to Marx's continued discussion of these ideas despite the decline of terms such as essence and alienation in his later work.
Buddhism
Within the Madhyamaka school of Mahayana Buddhism, Candrakirti identifies the self as:
Buddhapālita adds, while commenting on Nagārjuna's Mūlamadhyamakakārikā,
For the Madhyamaka Buddhists, 'Emptiness'  is the strong assertion that all phenomena are empty of any essence, and that anti-essentialism lies at the root of Buddhist praxis and it is the innate belief in essence that is considered to be an afflictive obscuration which serves as the root of all suffering. However, the Madhyamaka also rejects the tenets of Idealism, Materialism or Nihilism; instead, the ideas of truth or existence, along with any assertions that depend upon them are limited to their function within the contexts and conventions that assert them, possibly somewhat akin to Relativism or Pragmatism. For the Madhyamaka, replacement paradoxes such as Ship of Theseus are answered by stating that the Ship of Thesesus remains so  until it ceases to function as the Ship of Theseus.
Among the many canonical Buddhist sources articulating a philosophical "god of love," stands Nagarjuna's Mulamadhyamakakarika, The Fundamental Wisdom of the Middle Way. Chapter I examines the Conditions of Existence, while Chapter XV examines Essence in itself, difference, the eternalist's view and nihilist's view of essence and non-essence.
Hinduism
In understanding any individual personality, a distinction is made between one's Swadharma  and Swabhava . Svabhava is the nature of a person, which is a result of his or her samskaras . These samskaras create habits and mental models and those become our nature. While there is another kind of svabhava that is a pure internal quality — smarana — we are here focusing only on the svabhava that was created due to samskaras . Dharma is derived from the root dhr "to hold." It is that which holds an entity together. That is, Dharma is that which gives integrity to an entity and holds the core quality and identity, form and function of that entity. Dharma is also defined as righteousness and duty. To do one's dharma is to be righteous, to do one's dharma is to do one's duty .
See also
Avicenna
Essentialism
Modal logic
Phenomenon
Physical ontology
Smarana
Theory of forms
Notes and references
External links
Maurice De Wulf:, in: The Catholic Encyclopedia. Vol. 11. New York: Robert Appleton Company, 1911.


Bibliography:
Wikipedia
@baygross