Faith, according to the Apostle James, is conviction in the reality of some religious truth, for example, the existence of God, together with outward confession of that conviction.
Confession may be hypocritical. Yet even when it is not, it testifies only to a judgment of the mind. It is the fruit of reasoning. Such faith, says James, cannot save a person.
The works of which James speaks consist in fulfilling Christian duties, for example, caring for widows and orphans and showing compassion to the poor. The motive for these works in James is also faith (Jas 2:22).
For Paul, faith is an entirely new and particular relation in which man stands toward Christ and, through Him, toward God.
Faith is both the beginning and the manner of an existence wholly different from the natural state. It is thought, desire, and action, in a word, a whole life animated by the Spirit of God and producing only what belongs to God.
James does not contradict this view. The works rejected by Paul are works called forth by the demands of the external law, commanded works, not voluntary actions of an inward disposition conformed to God's will.
Such legal works, being incomplete, do not together constitute perfect righteousness. The Apostle James says the same positively (Jas 2:10 and following).
Applying these concepts of faith and works to justification, we can express the Apostles' thoughts as follows. First, Paul says: one must believe, because faith alone gives man justification, forgiveness of sins, and salvation.
Works signify nothing. Justification is accomplished with regard to faith, and before a person has done anything to merit it. Grace gives such power to faith.
When a person has faith, then works follow of themselves. Indeed, they must follow; otherwise it would not be true faith. Yet justification is not given because of the works that follow faith, but because of the faith that precedes them.
Second, James teaches that a person must have good works, because they give justification to man, and not faith alone. Justification is accomplished as works enter in.
Faith must undoubtedly cooperate, συνεργεῖν, in their accomplishment (Jas 2:22). But where there are no works, faith is nothing. It is dead, that is, it remains without effect.
It becomes active and perfect only through the works which it produces. Thus both Apostles approach one and the same thing from different sides. In the end both require a living and active faith.
According to Paul, faith is necessary for justification, as the source of good works. According to James, good works are necessary for justification, because they are the fruit of faith.