 As noted above (see,  sec. 3)  and below  (secs. 4.4 and 4.5),  “independent of experience” should not be taken to mean independent of all experience, but, as a first approximation, to mean “independent of all experience beyond what is needed to grasp the relevant concepts involved in the proposition”. It is sometimes said that a priori justification can depend on experience insofar as it enables the person to acquire the concepts needed to grasp the meaning of the proposition which is the object of justification, but experience cannot play an evidential role in that justification (Williamson 2013: 293). Later we will see that the notion of enabling experience might better be expanded to include experience needed to acquire certain intellectual skills such as those needed to construct certain proofs or create counterexamples (see,  secs. 4.4 and 4.5,  below).