ANSWER: As Christ on the cross was regarded by men as accursed or separated from God in making the atonement, so Paul could, if it were possible, take Christ's place, or make another atonement on the top of Christ's atonement to save the Hebrew people. As dying for one condemned to be executed is the highest possible expression of love, so Paul's love for his race would prompt him to submit to an ignominious, judicial death if that would save his "kinsmen according to the flesh" from the doom of eternal punishment. A present day Arab expresses his love for another by saying, "Let my life be a ransom for thee." The Oriental mind is full of the solemn thought of substitutive suffering.
— Steele's Answers p. 141.