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You cannot prove realism to a complete sceptic or idealist; but you can show an honest man that he is not a complete sceptic or idealist, but a realist at heart. So long as he is alive his sincere philosophy must fulfil the assumptions of his life and not destroy him.

Durant Drake, Arthur Oncken Lovejoy, James Bissett Pratt, Arthur Kenyon Rogers, George Santayana (1920). “Essays in critical realism: a co-operative study of the problem of knowledge”
You cannot prove realism to a complete sceptic or idealist; but you can show an honest man that he is not a complete sceptic or idealist, but a realist at heart. So long as he is alive his sincere philosophy must fulfil