The basic difference then that distinguishes Christian from non-Christian ethics, is the acceptance, or denial, of the ultimately self-determinative will of God. As Christians we hold that determinate human experience could work to no end, could work in accordance with no plan, and could not even get under way, if it were not for the existence of the absolute will of God.
It is on this ground then that we hold to the absolute will of God as the presupposition of the will of man. Looked at in this way, that which to many seems at first glance to be the greatest hindrance to human responsibility, namely the conception of an absolutely sovereign God, becomes the very foundation of its possibility.
– Cornelius Van Til, The Defense of the Faith p.84
Note by K. Scott Oliphint from the 4th edition:
“Here Van Til is employing a transcendental approach to the application of Christian truth. Given that there is self-determination in the will of man, what are the presuppositions behind that self-determination that make it possible? Van Til’s answer is, here and always, the presupposition of God and his character as it is expressed in Reformed theology.”