Nothing but the cross?

Thanks to Tim V-B for putting me onto this article, by Peter Leithart, which blows the mind and thrills the heart, ideally in equal measure. I confess that in my case it is more the former! But none the less - glorious: 

The cross is the crux, the crossroads, the twisted knot at the center of reality, to which all previous history leads and from which all subsequent history flows. By it we know all reality is cruciform—the love of God, the shape of creation, the labyrinth of human history. Paul determined to know nothing but Christ crucified, but that was enough. The cross was all he knew on earth; but knowing the cross he, and we, know all we need to know. [Christ and Him Crucified, Peter Leithart]