Apologetics cannot precede faith and does not attempt a priori to argue the truth of revelation. It assumes the truth and belief in the truth. It does not, as the introductory part or as the foundational science, precede theology and dogmatics. It is itself a theological science through and through, which presupposes the faith and dogmatics and now maintains and defends the dogma against the opposition to which it is exposed. Thus understood, apologetics is not only perfectly justified but a science that at all times, but especially in this century, deserves to be seriously practiced and can spread rich blessing all around. First of all, it has the immediate advantage of forcing Christian theology to take deliberate account of the grounds on which it is based, of the principles on which it is constructed, and of the content it has within itself. It brings Christian theology out of the shadows of the mysticism of the human heart into the full light of day. Apologetics, after all, was the first Christian science. Secondly, it teaches that Christians, even though they cannot confer faith on anyone, need not hide from their opponents in embarrassed silence. With their faith they do not stand as isolated aliens in the midst of the world but find support for it in nature and history, in science and art, in society and state, in the heart and conscience of every human being. The Christian worldview alone is one that fits the reality of the world and of life. And finally, if it seriously and scrupulously performs its task, it will very definitely succeed in impressing opponents with the truth of Christian revelation, refuting and silencing them. It cannot truly convert people to God. Not even the preaching of the gospel is able to do that; only God, by his Spirit, can accomplish that. But subject to this working of God, and as a means in his hand, apologetics, like the ministry of the Word, can be a source of consummate blessing. For this fact the early centuries of Christianity offer abundant evidence.
Reformed Dogmatics Vol. 1: Prolegomena (Grand Rapids, Michigan; Baker Academic; 2003) p. 515.