He coins the concept of the “paradox of faith” since the form of faith entails a contradictory encounter of God and human beings. He also portrayed the contemporaneity of the moment when in crisis a human being desperately perceives the contemporaneity of Christ.
He coined the term "paradox of faith" due to the conflicting nature of how faith manifests as an encounter with both God and humans. Additionally, he illustrated the simultaneous nature of this moment where, during a crisis, individuals recognize the coexistence of Christ.