Isaiah 43 emphatically identifies the LORD as the only Savior. Christian application therefore depends on the New Testament's remarkable identification of saving authority with Jesus.

The fulfillment passages listed here (Acts 4:12) illuminate the Christian application summarized as "He is the only Savior." The correspondence is meaningful within the New Testament portrait of Jesus, but where the New Testament does not explicitly quote this exact Isaiah verse as fulfilled, it is best described as a theological or messianic correspondence rather than claiming more precision than the biblical writers themselves state.