This article is primarily concerned with Truth as it is used in the evaluation of assertions. For example, It is true that the world is a sphere. When used in this way, it is properly contrasted with false. Truth is a concept of primary importance to philosophy, science, law, and religion.
The correspondence theory of truth sees truth as correspondence with objective reality. Thus, a statement is said to be true just in case it expresses a state of affairs in the world.
The coherence theory sees truth as coherence with some specified set of statements. Usually the set is identified as the statements that make up what is the best justified and most complete description of the world.
The consensus theory, invented by Charles Sanders Peirce sees truth as something agreed upon by some specified group, such as all competent investigators.
Pragmatism sees truth as the success of the practical consequences of an idea, i.e. its utility.
Social constructivism holds that truth is constructed by social processes, and is represents the power struggles within a community.
Each can be interpreted as either a definition of the fundamental nature of truth, or as a criterion for determining truth values. So, for instance, a realist might define truth as correspondence with the facts, and argue that the only valid way to determine the truth of a proposition is to see if it corresponds to the facts. A Coherentist might also define truth as correspondence with mind-independent reality, but also maintain that the truth or falsity of a statement is determined by its cohering with the body of accepted scientific knowledge. Pierce in his later writings thought that truth was defined as correspondence with reality, but held that the truth or falsity of a proposal was determined by the agreement of the relevant experts.
where 'P' is a reference to the sentence (the sentence's name), and P is just the sentence itself. The semantic theory can be applied to languages with a denumerable number of sentences. In a natural language such as English this process consists simply of quoting the sentence, so:
This definition of truth has also been called the disquotation, since the term on the right is simply the term on the left, without the quotes.
Its inventor, philosopher-logician Alfred Tarski, thought of it as a species of correspondence theory, in which the term on the right is assumed to correspond to the facts. On this account, to say that 'P is true' is to do no more than to assert P. In this regard, it can also be considered a form of the deflationary theory of truth.
Deflationary theories, after Gottlob Frege and F. P. Ramsey, also point out that "truth" is not the name of some property of propositions — some thing about which one could have a theory. The belief that truth is a property is just an illusion caused by the fact that we have the predicate "is true" in our language. Since most predicates name properties, we naturally assume that "is true" does as well. But, they say, statements that seem to predicate truth are actually doing nothing more than signal agreement with the statement. For example, the redundancy theory of truth holds that to assert that a statement is true is just to assert the statement itself. Thus, to say that "It is true that snow is white" is to say nothing more nor less than that show is white. A second example is the performative theory of truth which holds that to say "It is true that snow is white" is to perform the speech act of signalling one's agreement with the claim that snow is white (much like nodding one's head in agreement). The idea that some statements are more actions than communicative statements is not as odd as it may seem. Consider, for example, that when the bride says "I do" at the appropriate time in a wedding, she is performing the act of taking this man to be her lawful wedded husband. She is not describing herself as taking this man.
In contrast, Objective truths are supposed in some way to be independent of our subjective beliefs and tastes. Such truths would subsist not in the mind but in the external object. Maurice Merleau-Ponty argued that grasping such truths requires one to view the world from everywhere at once, a facility only God might achieve.
Relative truths can be contrasted with absolute truths. The latter are statements or propositions that are taken to be true for all cultures and all eras. For example, for Muslims Allahu Akbar expresses an absolute truth; for the micro economist, that the laws of supply and demand determine the value of any consumable in a market economy is true in all situations; for the Kantian, "act only according to that maxim by which you can at the same time will that it should become a universal law" forms an absolute moral truth. They are truths that are claimed to emanate from the very nature of the universe, God, or some other ultimate essence or transcendental signifier.
Surprisingly, truths advocated as absolute tend to be those of the powerful in the culture of the advocate.
Absolutism in a particular domain of thought is the view that all statements in that domain are either absolutely true or absolutely false: none is true for some cultures or eras while false for other cultures or eras. For example, Moral Absolutism is the view that moral claims such as "Abortion is wrong" or "Charity is good" are either true for all people in all times or false for all people in all times.
Witnesses who swear under oath to testify truthfully in courts of law, are not expected to make infallibly true statements, but to make a good faith attempt to recount an observed event from their memory or provide expert testimony. That what one witness says may differ from true accounts of other witnesses is a commonplace occurrence in the practice of law. Triers-of-fact are then charged with the responsibility to determine the credibility or veracity of a witness' testimony.
"Truth - Something somehow discreditable to someone." — H.L. Mencken
"Truth exists - only lies are invented." — Georges Braque
"To me, truth is not some vague, foggy notion. Truth is real. And, at the same time, unreal. Fiction and fact and everything in between, plus some things I can't remember, all rolled into one big 'thing'. This is truth, to me." — Jack Handey
"I am the the way, the truth, and the life: no man cometh unto the Father, but by me." — Jesus Christ — John 14:6 (original Greek is αλ´ηθεια : truth, verity)
"One of the grand fundamental principles of Mormonism is to receive truth, let it come from whence it may . . . We should gather all the good and true principles in the world and treasure them up, or we shall not come out true Mormons." — Joseph Smith, Jr
"What is truth? said jesting Pilate, but would not stay for an answer" — Francis Bacon, Essays 1: Of Truth
