Without a doubt, at the center of the New Testament there stands the Cross, which receives its interpretation from the Resurrection.
The Passion narratives are the first pieces of the Gospels that were composed as a unity. In his preaching at Corinth, Paul initially wants to know nothing but the Cross, which "destroys the wisdom of the wise and wrecks the understanding of those who understand", which "is a scandal to the Jews and foolishness to the gentiles". But "the foolishness of God is wiser than men, and the weakness of God is stronger than men" (I Cor 1:19, 23, 25).
Whoever removes the Cross and its interpretation by the New Testament from the center, in order to replace it, for example, with the social commitment of Jesus to the oppressed as a new center, no longer stands in continuity with the apostolic faith.
–Hans Urs von Balthasar (1905-1988), A Short Primer For Unsettled Laymen