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[timelets]

“Now philosophical systems are absolutely true only to their founders, to all later philosophers they are usually one big mistake, and to feebler minds a sum of mistakes and truths; at any rate if regarded as highest aim they are an error, and in so far reprehensible. Therefore many disapprove of every philosopher, because his aim is not theirs; they are those whom I called "strangers to us." Whoever on the contrary finds any pleasure at all in great men finds pleasure also in such systems, be they ever so erroneous, for they all have in them one point which is irrefutable, a personal touch, and colour; one can use them in order to form a picture of the philosopher, ”

--- Friedrich Wilhelm Nietzsche. “Early Greek Philosophy & Other Essays / Collected Works, Volume Two.”

Deleuze's "What is philosophy?" is a book-length essay developed from Nietzche's original idea.