Full Idea
Immediate 'seeing', not merely sensuous, experiential seeing, but seeing in the universal sense as an originally presenting consciousness of any kind whatsoever, is the ultimate legitimising source of all rational assertions.
Gist of Idea
Direct 'seeing' by consciousness is the ultimate rational legitimation
Source
Edmund Husserl (Ideas: intro to pure phenomenology [1913], I.2.019), quoted by Victor Velarde-Mayol - On Husserl 3.3.5
Book Reference
Velarde-Mayol,Victor: 'On Husserl' [Wadsworth 2000], p.57
A Reaction
Husserl is (I gather from this) a classic rationalist. Just like Descartes' judgement of the molten wax.