13 If we are unbelieving, he remaineth faithful The meaning is, that our base desertion takes nothing from the Son of God or from his glory; because, having everything in himself, he stands in no need of our confession. As if he had said, “Let them desert Christ who will, yet they take nothing from him; for when they perish, he remaineth unchanged.”
He cannot deny himself This is a still stronger expression. “Christ is not like us, to swerve from his truth.” Hence it is evident, that all who deny Christ are disowned by him. And thus he drives away from wicked apostates the flatteries with which they soothe themselves; because, being in the habit of changing their hue, according to circumstances, they would willingly imagine that Christ, in like manner, assumes various forms, and is liable to change; which Paul affirms to be impossible. Yet, at the same time, we must firmly believe what I stated briefly on a former passage, that our faith is founded on the eternal and unchangeable truth of Christ, in order that it may not waver through the unsteadfastness or apostasy of men.