The Problems of Philosophy discussion

This was a good one, even half-awake and waiting to board my flight. I sort of wish I read this book as a teenager; I think I would have got a lot out of it.

Wrt this quote:

“All arguments which, on the basis of experience, argue as to the future or the unexperienced parts of the past or present, assume the inductive principle; hence we can never use experience to prove the inductive principle without begging the question. Thus we must either accept the inductive principle on the ground of its intrinsic evidence”

I really like the first point that we can't use the inductive principle (via an appeal to previous experience) to prove the inductive principle. But then what does he mean by "its intrinsic evidence"? What exactly is the intrinsic evidence of the principle itself? I guess that's what we're going to get to next?