When an artist's picture is perfect in everything except one part, which is inferior in finish to the others, it is enough to remind him of it.
This will provoke his zeal to give the last part the same perfection shown by the whole picture. So the Apostle acts with the Corinthians.
He praised them in every respect, and then says: see that your giving of alms does not stand in disharmony with your other perfections.
Yet it is not difficult to notice that the qualities of the Corinthians praised by him are chiefly theoretical: faith, the gift of speech, understanding.
The active side was visibly weaker among them, as may be concluded from the content of the first epistle. Yet Christianity is above all action.
Its theory is very brief. It can be contained in a few words. But its action has no end.
The first step in it is action, repentance. After that, every step is action and action again.
No step in it can be made by speculation alone, without action. The intellectual side in it stands externally, like candles and lamps in a workshop.
Work is done by the light. The light is a helper and assistant, but not the principal producer.
This is why the Apostle makes such an effort to dispose the Corinthians toward almsgiving. For it is the nearest expression of love for neighbors, which also bears witness to love for God.
Almsgiving is sweet. It involuntarily draws a person into the active life in general.