| Many philosophers appeal to the notion of the self-evidence.Self-evidence is proved in induction and deduction.It is the absulute starting andhighest standand of knowledge. It is widely used by many aestheticians andphilosophers. Descaetes secured self-evidence in the inner consciousness. And hetried to consummate the existence of self-evidence by relying on his clear anddistinct perception in his mental faculties. Brentano regarded self-evidence as thepurpose of insight and the souece of value. In the sight of Husserl, self-evidence isnot the manifesttation of the object it self, but is something given directly to thesubject, and the inner consciousness is self-evident. In the modern aesthetic vision,the meaning of self-evidence is self-contain and co-given.This paper develops anaccount of what it is for a proposition to be self-evident to someone, based on theidea that certain propositions are such that certain propositions are such that to fullyunderstand them is to believe them. It argue that when a proposition p isself-evident to one, one has non-inferential a priori justification for believing that pand a welcome feature,a justification that does not involve exercising any specialsort of intuitive faculty; in addition, if it is true that p and there exists no reason tobelieve that the proposition that p is incoherent, then one knows a priori that p. Thepaper discusses that certain deeply contingent truth, the truth that now we mayexpress by saying"i exist", can be self-evident to,and thus known a priori by, theperson they are about at the time the are about; but,since they cannot be known apriori, or even expressed, by anyone else or at any other time, they should notcount as a priori truths. |