# The Origin of Our Knowledge of Right and Wrong Brentano **Opening (not a real abstract):** This lecture, which I now bring before a larger public, was given before the Vienna Law Society on January 23, 1889. At that time it was entitled “On the Natural Sanction for Law and Morality [Von der natürlichen Sanktion für recht und sittlich]”. I have changed the title in order to make more clear just what the actual content of the lecture is. But otherwise I have made almost no changes at all. I have added numerous notes and appended one essay that had been previously published—namely, “Miklosich on Subjectless Propositions”. Its bearing upon what may seem to be a very different subject matter will become evident in what follows. The occasion of the lecture was an invitation from Baron von Hye, President of the Vienna Law Society. He asked me to present my own views on the subject that Ihering