The prophets, God’s preachers of old, were commanded by the Lord to proclaim God’s law-word concerning all things and to correct and rebuke kings and governors. When our Lord promises His disciples that they shall be brought before governors and kings for His sake, and “for a testimony against them” (Matt. 10:18), He did not mean they were then to forswear the faith, wink at abortion and homosexuality, and be silent about the sins of the state!
There are no limits to the area of God’s government, law, and sovereign sway. There can then be no limits to the areas of the church’s witness, its preaching, and its commanded concern.
Rushdoony, R.J. (1986). Christianity and the State. Ross House Books, Vallecito, p. 192