Further, the notion of the law as specially imposed by God with a view to reward also points to the absurdity of seeing Christ as under law for his own sake: again, the hypostatic union itself was quite sufficient to make Christ’s human nature worthy of eternal life for itself. Here we see the obvious doctrinal intersection of the covenant of works and that of redemption in the context of Christology and mediation [...] [A]s a representative human being, Christ must both fulfill the law positively on behalf of humanity because of Adam’s abject failure so to do, and he must undergo punishment of death because of Adam’s breaking of the original covenant. It is not Christ’s ontology as the Divine-human person which requires this, but his covenantal status as representative which demands it.

Carl Trueman, “John Owen on Justification”. Justified in Christ (New York: Mentor, 2007), 89.