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"Philosophy is an activity, said Wittgenstein, not a doctrine. But how can we find what activity is worthwhile, what not, unless we have a doctrine? Do we have a doctrine about intellectual activity in general, applicable to the activity called philosophy? I could not get a clear yes-or-no either from Wittgenstein's works, or from other books."
 
—- Joseph Agassi, Science & Society, p.34.