This advocacy is here called, as elsewhere, "pleading the cause" of the believer, and is connected with deliverance, for such an advocate can never fail: "O Lord, thou hast pleaded the causes of my soul; thou hast redeemed my life" (Lam. 3:58). The figure is taken from a lawyer pleading the cause of a criminal, and using his best endeavours to bring him off uninjured.
But such advocacy may fail for two reasons: 1. the incompetency of the advocate; or 2. the badness of the cause. But there are no such hindrances to the success of the advocacy of Christ. How he can plead his own sufferings, blood, and obedience. His very Person as the Son of God, and yet son of man, gives unspeakable value and validity to every plea of the great Intercessor.
What validity, then, has his intercession in the court of heaven! It is true that he cannot deny the truth of the charge brought by the accuser of the brethren against his client; but he can present his own meritorious sufferings, and the sorrows he endured for the culprit. On this ground he can stand up as his surety and representative, and plead with the Father that he has suffered in his place and stead.
On the firm, solid ground, then, of justice and equity, he can plead on his behalf, "Let him go, for I endured the penalty due to him."