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It is not conflict of opinions that has made history so violent but conflict of belief in opinions, that is to say conflict of convictions.

Friedrich Nietzsche, R. J. Hollingdale (1996). “Nietzsche: Human, All Too Human: A Book for Free Spirits”, p.200, Cambridge University Press
It is not conflict of opinions that has made history so violent but conflict of belief in opinions, that is to say conflict of convictions.