These lines are from the second movement of "East Coker", the second quartet of T.S. Eliot's Four Quartets:
...There is, it seems to us,
At best, only a limited value
In the knowledge derived from experience.
And so these lines, also from "East Coker",
...Do not let me hear
Of the wisdom of old men, but rather of their folly,...
might also apply to spiders....