Full Idea
My conviction is that philosophy is a priori if it is anything.
Clarification
Meaning it comes from thinking, not from experience
Gist of Idea
Philosophy is a priori if it is anything
Source
Laurence Bonjour (In Defence of Pure Reason [1998], Pref)
Book Reference
Bonjour,Laurence: 'In Defense of Pure Reason' [CUP 1998], p.-4
A Reaction
How about knowledge of a posteriori necessities, such as the length of a metre, known by observation of the standard metre in Paris?