The Reformation was dynamic. Sola fide was not the slogan of a delicate, cloistered piety. It was the ensign of a movement of blood and fire. It is an acknowledgement that Christ Himself, in our name and our behalf, met all our obligations before the bar of eternal justice. This redemptive act was so complete and perfect that we cannot add anything to it.
Nothing needs to be added to it.
Sola fide means that we cannot in the least contribute to our salvation, but that we must submit to what God has already done-fully and completely. Only One is righteous, One is pleasing. That is what is meant to be justified by faith. There are some who will admit that God alone saves, but they imagine that this saving work is done inside of them. But it was done outside the gate of Jerusalem on a Roman cross.