"One can delineate the domain of philosophy however one likes, but in its search for truth, philosophy is always concerned with human existence.  Authentic philosophizing refuses to remain at the stage of knowledge […].  Care for human existence and its truth makes philosophy a 'practical science' in the deepest sense, and it also leads philosophy—and this is the crucial point—into the concrete distress of human existence."

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We are wont to see friendship solely as a phenomenon of intimacy in which the friends open their hearts to each other unmolested by the world and its demands...Thus it is hard for us to understand the political relevance of friendship...But for the Greeks the essence of friendship consisted in discourse...The converse (in contrast to the intimate talk in which individuals speak about themselves), permeated though it may be by pleasure in the friend’s presence, is concerned with the common world.

— Hannah Arendt