Jürgen Moltmann, The Crucified God:
In Christianity the cross is the test of everything which deserves to be called Christian… The Christian life of theologians, churches and human beings is faced more than ever today with a double crisis: the crisis of relevance and the crisis of identity. These two crises are complementary. The more theology and the church attempt to become relevant to the problems of the present day, the more deeply they are drawn into the crisis of their own Christian identity….
Christian identity can be understood only as an act of identification with the crucified Christ, to the extent to which one has accepted that in him God has identified himself with the godless and those abandoned by God, to whom one belongs oneself. [pgs. 7, 19]