It has existed since ancient Greece, the focus of this theory is that all knowledge or cognitive awareness of the subject (human being) are based on a solid foundation. This foundation serves not only as the starting point merely as a basis for knowledge of the truth of existence. Thinking is the process of proving the validity of knowledge, not proving the rationality of the foundation from which knowledge is shaped. This means, with ultimate cause, the foundation is true, absolute, entire and impossible to prove. Neopragmatist philosopher Richard Rorty, a proponent of anti-foundationalism, said that the fundamentalism confirmed the existence of the "privileged representation" which constitutes the foundation, from which dominates epistemology. Plato's theory of Forms is the earliest foundationalism. So from the point of view of Plato, the Forms shows the general concept which plays as a model for the release of existence, which is only the faint copy of the Forms of eternity, that means, understanding the expression of objects leads to acquiring all knowledge, then acquiring knowledge accompanies achieving the truth. Achieving the truth means understanding the foundation. This idea still has some appeal in for example international relations studies. Foundationalism holds basic beliefs exist, which are justified without reference to other beliefs, and that nonbasic beliefs must ultimately be justified by basic beliefs. Classical foundationalism maintains that basic beliefs must be infallible if they are to justify nonbasic beliefs, and that only deductive reasoning can be used to transfer justification from one belief to another. Laurence BonJour has argued that the classical formulation of foundationalism requires basic beliefs to be infallible, incorrigible, indubitable, and certain if they are to be adequately justified. Mental states and immediate experience are often taken as good candidates for basic beliefs because it is argued that beliefs about these do not need further support to be justified. As an alternative to the classic view, modest foundationalism does not require that basic perceptual beliefs are infallible, but holds that it is reasonable to assume that perceptual beliefs are justified unless evidence to the contrary exists. This is still foundationalism because it maintains that all non-basic beliefs must be ultimately justified by basic beliefs, but it does not require that basic beliefs are infallible and allows inductive reasoning as an acceptable form of inference. For example, a belief that 'I see red' could be defeated with psychological evidence showing my mind to be confused or inattentive. Modest foundationalism can also be used to avoid the problem of inference.