Erich Heller, “Wittgenstein and Nietzsche,” The Artist’s Journey into the Interior, 1968:
Like Nietzsche, then, [Wittgenstein] knew that philosophical opinion was not merely a matter of logically demonstrable right or wrong. This most rigorous logician was convinced that it was above all a matter of authenticity—and thus, in a sense, not at all of negotiable opinions. What assumed with him so often the semblance of intolerable intellectual pride, was the demand, which he made upon himself still more than upon others, that all utterances should be absolutely authentic. The question was not only “Is this opinion right or wrong?” but also “Is this or that person entitled to this or that opinion?” At times this lent to his manner of debating the harsh tone of the Old Testament prophets: he would suddenly be seized by an uncontrollable desire to mete out intellectual punishment. He reacted to errors of judgment as if they were sins of the heart, and violently rejected opinions, which in themselves—if this distinction were possible—might have been harmless enough or even “correct,” and rejected them because they were untrue in the self that uttered them: they lacked the sanction of the moral and intellectual pain suffered on behalf of truth.