The Kingdom of God is Within You by Leo Tolstoy Chapter 4 Page 60

religions, by rules, which they are bound to follow, and that these rules cannot be fulfilled. The second is the idea that the whole purport of Christianity is to teach men to live advantageously together, as one family, and that to attain this we need only follow the rule of love to humanity, dismissing all thought of love of God altogether.

The mistaken notion of scientific men that the essence of Christianity consists in the supernatural, and that its moral teaching is impracticable, constitutes another reason of the failure of men of the present day to understand Christianity.