But reflection and enquiry should satisfy us that to our predecessors we are indebted for much of what we thought most our own, and that their errors were not wilful extravagances or the ravings of insanity, but simply hypotheses, justifiable as such at the time when they were propounded, but which a fuller experience has proved to be inadequate. It is only by the successive testing of hypotheses and rejection of the false that truth is at last elicited. After all, what we call truth is only the hypothesis which is found to work best.