The word vicarious is extremely important to our understanding of the atonement of Christ. The late Swiss theologian Karl Barth once said that, in his judgment, the single most important word in all of the Greek New Testament is the minuscule word huper. This little word is translated by the English phrase “in behalf of.” Barth was clearly engaging in a bit of hyperbole in making this statement, because many words in the New Testament are arguably as important or even more important than huper, but he was simply seeking to call attention to the importance of what is known in theology as the vicarious aspect of the ministry of Jesus.