The Kingdom of God is Within You by Leo Tolstoy Chapter 3 Page 90

could not act differently. The churches are placed in a dilemma: the Sermon on the Mount or the Nicene Creed — the one excludes the other. If a man sincerely believes in the Sermon on the Mount, the Nicene Creed must inevitably lose all meaning and significance for him, and the Church and its representatives together with it.

If a man believes in the Nicene Creed, that is, in the Church, that is, in those who call themselves its representatives, the Sermon on the Mount becomes superfluous for him. And therefore the churches cannot but make every possible effort to obscure the meaning of the Sermon on the Mount, and to attract men to themselves. It is only due to the intense zeal of the churches in this direction that the influence of the churches has lasted hitherto.