Harman on Modularity

I like this line:

"There is a certain modularity of philosophical insights that doesn’t hold for geometrical or arithmetical proofs, where any antecedent errors spoil everything else that comes later. Philosophy doesn’t work like that. You can think that the metaphysical underpinnings of Aristotle or Spinoza are rubbish, but still profit greatly from all that emanates from the supposed rubbish."