After the incarnation, any talk about God must have the man Christ-Jesus as a fundamental referent. It was this fact that led Karl Barth to state: “Man has become the measure of all things since God became man.” In other words, since God has become human in Jesus Christ, revealing not just his true self but the true identity of man, the fundamental issue of theology has ceased to be “who is God” and has become instead “who is the true man.” Hence we can assert that theology has become a contextual discipline since the incarnation of God in Jesus of Nazareth
…it must also be true that Jesus Christ is today one with the outcast and oppressed of the earth. Wherever there is oppression, there is the Spirit of Christ incarnated in the experience of the oppressed; there is God contextualized in the present history of the non-persons of society
…Instead of feeling threatened, we should see in the incarnation of Christ among the destitute a reminder of the scandal of the gospel and the radical nature of conversion. The good news of salvation does not come to us via the wise and mighty, but rather by way of the ignorant and downtrodden (I Co. l:18ff). Neither is the call to conversion an invitation to sooth our guilty consciences, to reinforce our privileged status and to give us strength to continue to be part of an oppressive social system. It is rather an invitation to put our trust in the Lord and Saviour of the poor and the oppressed, to turn from our personal sins and from our alliances with the oppressive structures of this world, to join the struggle of God’s kingdom against the forces of evil — of injustice, exploitation and repression.
Orlando Costas, “Contextualization and Incarnation,” Journal of Theology for South Africa