Antithesis, Synthesis, and Dualism

It is not many years ago that it was a rather generally accepted principle with Reformed people, that in this whole life, in every sphere of life in the midst of the world, the Christian was called to assume an antithetical attitude towards the world of darkness. For what did righteousness and unrighteousness have in common? Or what concord is there between Christ and Belial? The natural man minded the things of the flesh, and the carnal mind is enmity against God, it is not subject to the law...