Paul Tillich played a key role in connecting theology with psychology, literature, and the arts.
This is a quote from his Systematic Theology.
Idolatry is the elevation of a preliminary concern to ultimacy. Something
essentially conditioned is taken as unconditional, something essentially partial
is boosted into universality, and something essentially finite is given infinite
significance (the best example is the contemporary idolatry of religious
nationalism). The conflict between the finite basis of such a concern and its
infinite claim leads to a conflict of ultimates; it radically contradicts the
biblical commandments and the first theological criterion.
Paul Tillich, Systematic Theology, Volume 1 (University of Chicago Press, 1951), pages 11-14.