The believer is sensible of his infirmities, for it is supposed that he is wrestling under them. He sees, he feels, that he is not man enough for his work; that his own hands are not sufficient for him, nor his own back for his burden; this is what drives him out of himself to the grace that is in Christ Jesus. And thus he lies open to the help of the Spirit, while proud nature in unbelievers is left helpless.