Once when Swiss theologian Karl Barth was asked what he thought was the most important word in the New Testament, he asnwered, “Huper.” Huper is a preposition meaning “on behalf of” or “in place of.” So when Barth called huper the most important word, he meant that the most important of all truths is that in salvation Jesus takes our place to bear the punishment for our sins so that “in him we might become the righteousness of God” (2 Cor. 5:21). – James Montgomery Boice, Whatever Happened to the Gospel of Grace?, p. 102