In texts such as Vasubandhu's Twenty Verses: A Demonstration on Existence of Consciousness Only (Viṃśatikā Vijñaptimātratāsiddhi; hereafter VVS) and Dignāga's Investigation of the Cognitive Support (Ālambanaparīkṣā; and its Vṛtti; hereafter APV) we are presented with a metaphysical picture of cognitive awareness or consciousness as the only ultimately existing reality.
Among the three early works noted above, Kant's most focused treatment of these arguments for the existence of God can be found in The One Possible Basis for a Demonstration of the Existence of God.
Actually, Kant belied his own professions at the time insofar as he thought himself in possession of a definitive proof of God's existence, which he explained in his essay Der einzig mögliche Beweisgrund zu einer Demonstration des Daseyns Gottes (1763; "The Only Possible Ground for a Demonstration of the Existence of God").
The Only Possible Argument in Support of a Demonstration of the Existence of God (1762 3) is a major book in which Kant drew on his earlier work in Universal History and New Elucidation to develop an original argument for God's existence as a condition of the internal possibility of all things, while criticizing other arguments for God's existence.
Indeed, according to some scholars, this is the only place to track down a demonstration of the existence of the Principle in the Metaphysics of the Book of the Healing (Bertolacci 2007).
A demonstration of the existence of biodegradation processes was however required by the regulatory authority within a timeframe that did not allow a full geochemical characterization of such a complex site.
Among the important early works of Kant that touched upon the topic of God are A New Exposition of the First Principles of Metaphysical Knowledge (1755), Universal Natural History and Theory of the Heavens (1755), and The One Possible Basis for a Demonstration of the Existence of God (1763).
An early version of such an argument can be found in Augustine and the Neo-Platonic tradition, but the canonical presentations of this sort of "possibility proof" are in Leibniz's Monadology (1714) and, much more elaborately, in Kant's book-length treatise called The Only Possible Basis for a Demonstration of the Existence of God (1763).
He notes explicitly that none of the proofs he was prepared to offer amounted to a demonstration of God's existence, and indeed he felt that a demonstration was not possible.
In 1762, now pushing forty, Kant resumed this line of inquiry and wrote what would be his third book, Only Possible Ground of a Demonstration of God's Existence (1763).
A demonstration was typically held to proceed from necessarily true premises (often Aristotelian principles[26]) via a valid argument to a necessarily true conclusion, and part of what was at issue was whether we should be looking for a demonstration of God's existence, or something less which would nonetheless still be useful in the fight against atheism.
