John Calvin's understanding of justification was in substantial agreement with Martin Luther's. Calvin expanded this understanding by emphasizing that justification is a part of one's union with Christ. The center of Calvin's soteriology was Union with Christ. For Calvin, one is united to Christ by faith, and all of the benefits of Christ come from being united to him. Therefore, anyone who is justified will also receive all of the benefits of salvation, including sanctification. Thus, while Calvin agreed in substance with the "simultaneously saint and sinner" formulation, he was more definite in asserting that the result of being justified is a consequent sanctification. Calvin also used more definite language than Luther, spelling out the exchange notion of imputed righteousness: that the good works that Jesus did in his life (collectively referred to as the active obedience of Christ) are imputed to his people, while their sins were imputed to him on the cross.