Aristotle doesn’t exist for Nietzsche. - Leo Strauss

There were two reasons why contemporary Jews were inclined to celebrate Spinoza. The first is Spinoza's assumed merit about mankind and only secondarily about the Jews; the second is his assumed merit about the Jewish people and only secondarily about mankind. Both reasons had induced contemporary Jews not only informally to rescind the excommunication which the Jewish community in Amsterdam had pronounced against Spinoza, but even, as Cohen put it, to canonize him.

The works of the great writers of the past are very beautiful even from without. And yet their visible beauty is sheer ugliness, compared with the beauty of those hidden treasures which disclose themselves only after very long, never easy, but always pleasant work. This always difficult but always pleasant work is, I believe, what the philosophers had in mind when they recommended education. Education, they felt, is the only answer to the always pressing question, to the political question par excellence, of how to reconcile order which is not oppression with freedom which is not license.

Existentialism is a 'movement' which like all such movements has a flabby periphery and a hard center. That center is the thought of Heidegger.