R. C. Sproul on Ex Lex and Euthyphro"Cur Deus Homo" at Ligonier.org, from Tabletalk Magazine (September 1, 2005).
In the Ex Lex debate, the question was raised as to whether God’s will functioned apart from any law or outside of any law (ex lex), or whether the will of God was itself subjected to some norm of righteousness or cosmic law that God was required to follow and, therefore, His will was exercised under law (sub lego). The question was: Is God apart from law or is He under law? ¶ The church’s response to this dilemma was to say basically “a pox on both houses,” and to declare that God is neither apart from law nor under law in these respective senses. Rather, the church responded by affirming that God is both apart from law and under law, in so far as He is free from any restraints imposed upon Him by some law that exists outside of Himself. In that sense, He is apart from law and not under law. Yet at the same time, God is not arbitrary or capricious and works according to the law of His own nature. The church declared that God is a law unto Himself.