A warning from Karl Barth on forgetting the real purpose of theology:
The first thing to be said about the character of theological work as service is that it cannot be pursued for its own sake, in the manner of “art for art’s sake.” Whoever is seriously engaged in theological work knows that such a temptation lurks in many corners. Theology, especially in its form as dogmatics, is a uniquely fascinating science, since its beauty irresistibly elicits the display of intellectual architectonics. As inquiry into both the bright and the dim, or dust, figures and events of Church history, theology is at every point highly exciting, even from a purely secular point of view. And as exegesis, it is equally exciting because of the way in which it calls in equal measure for both minute attention and bold imagination.
The service of God and the service of man are the meaning, horizon, and goal of theological work.
Evangelical Theology: An Introduction, pp. 185-6