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In [[early Islamic philosophy]], [[Avicenna]] (Ibn Sina) defined truth as:

In [[early Islamic philosophy]], [[Avicenna]] (Ibn Sina) defined truth as:

{{quote|What corresponds in the mind to what is outside it.<ref>Osman Amin (2007), "Influence of Muslim Philosophy on the West", ''Monthly Renaissance'' '''17''' (11).</ref>}}

"What corresponds in the mind to what is outside it." Osman Amin (2007), "Influence of Muslim Philosophy on the West", ''Monthly Renaissance'' '''17''' (11).

Avicenna elaborated on his definition of truth in his ''[[Metaphysics]]'':

Avicenna elaborated on his definition of truth in his ''[[Metaphysics]]'':

{{quote|The truth of a thing is the property of the being of each thing which has been established in it.<ref name=Aertsen>Jan A. Aertsen (1988), ''Nature and Creature: Thomas Aquinas's Way of Thought'', p. 152. BRILL, ISBN 9004084517.</ref>}}

"The truth of a thing is the property of the being of each thing which has been established in it."  Jan A. Aertsen (1988), ''Nature and Creature: Thomas Aquinas's Way of Thought'', p. 152. BRILL, ISBN 9004084517.

In medieval [[Christian philosophy]], [[Thomas Aquinas]] wrote an elegant re-statement of Aristotle's view in his [http://www.newadvent.org/summa/1016.htm Summa I.16.1]:

In medieval [[Christian philosophy]], [[Thomas Aquinas]] wrote an elegant re-statement of Aristotle's view in his [http://www.newadvent.org/summa/1016.htm Summa I.16.1]:

{{quote|Veritas est adæquatio intellectus et rei. <br> (Truth is the conformity of the intellect to the things.)}}

"Veritas est adæquatio intellectus et rei" i.e. "Truth is the conformity of the intellect to the things."

In his ''Quodlibeta'', [[Thomas Aquinas]] wrote a commentary on Avicenna's definition of truth in his ''Metaphysics'' and explained it as follows:

In his ''Quodlibeta'', [[Thomas Aquinas]] wrote a commentary on Avicenna's definition of truth in his ''Metaphysics'' and explained it as follows:

{{quote|The truth of each thing, as Avicenna says in his ''Metaphysica'', is nothing else than the property of its being which has been established in it. So that is called true gold which has properly the being of gold and attains to the established determinations of the nature of gold. Now, each thing has properly being in some nature because it stands under the complete form proper to that nature, whereby being and species in that nature is.<ref name=Aertsen/>}}

"The truth of each thing, as Avicenna says in his ''Metaphysica'', is nothing else than the property of its being which has been established in it. So that is called true gold which has properly the being of gold and attains to the established determinations of the nature of gold. Now, each thing has properly being in some nature because it stands under the complete form proper to that nature, whereby being and species in that nature is." Aertsen

===Modern philosophers===

===Modern philosophers===