Full Idea
In the search for certainty, it is natural to begin with our present experiences, and in some sense, no doubt, knowledge is to be derived from them.
Gist of Idea
It is natural to begin from experience, and presumably that is the basis of knowledge
Source
Bertrand Russell (Problems of Philosophy [1912], Ch. 1)
Book Reference
Russell,Bertrand: 'The Problems of Philosophy' [OUP 1995], p.1
A Reaction
Is experience the 'natural' place to begin? It didn't seem to strike Descartes that way. It seems better to say that philosophy begins when we are not quite satisfied with experience, and the natural place to begin is 'dissatisfaction'.