" It is only through the mystery of the redeeming Incarnation that a Christian sees the proper dignity of human personality, and what it costs. The idea which he has of it stretches out indefinitely, and only attains the absolute fullness of its significance in Christ. But by the very fact that it is secular and not sacred, this common task does not in the least demand in its beginning a profession of faith in the whole of Christianity from each man. On the contrary, it includes in its characteristic features a pluralism which makes possible the convivium of Christians and non-Christians in one temporal city. "

― Jacques Maritain ,