With regard to the personnel who carry out the Church's charitable activity on the practical level, the essential has already been said: they must not be inspired by ideologies aimed at improving the world, but should rather be guided by the faith which works through love (cf. Gal 5:6). Consequently, more than anything, they must be persons moved by Christ's love, persons whose hearts Christ has conquered with his love, awakening within them a love of neighbour (par 33)If faith is a verb, then works are faith in action.
From whence cometh our criteria for good works? From the teaching of Jesus Himself throughout the entirety of the Gospels, in places like the twenty-fifth chapter of Matthew, to pick just one. I pick this one because recently I was exposed to the most eccentric reading of this passage I have ever encountered, one that would render Jesus' teaching utterly incoherent.
The relevant question, then, is, What do we mean by faith? More specifically, as the second part of the second chapter of the Letter of James deals with, what is the relationship of faith to life, or, stated in even simpler terms, Why does faith matter? Posing the question Why does faith matter?, brings us back to works without faith being dead. After all, you don't need faith to perform many good works, right? So, what does faith add to works, if anything at all? I'd say faith adds hope to good works, genuine hope. In this dimension the works wrought by faith together with hope, which is the flower of faith, are what make Christian service genuinely charitable.