"One thing only is needful: the knowledge of the simple and clear truth which finds place in every soul that is not stupefied by religious and scientific superstitions—the truth that for our life one law is valid—the law of love (seen in the sense of things like the laws of physics), which brings the highest happiness to every individual as well as to all mankind. Free your minds from those overgrown, mountainous imbecilities which hinder your recognition of it, and at once the truth will emerge from amid the pseudo-religious nonsense that has been smothering it." - Leo Tolstoy, A Letter To A Hindu, December of 1908 (roughly two years before his death): https://www.gutenberg.org/files/7176/7176-h/7176-h.htm
Tolstoy believed that an objective interpretation of the Sermon On The Mount - Matt 5-7, and its precepts—including to "not take an oath at all," holds the potential of becoming a kind of constitution for our conscience so to speak—for our hearts, as a species.
Leo Tolstoy's Wiki: https://en.m.wikipedia.org/wiki/Leo_Tolstoy