6 Riches, and gold, and silver are not, as some think, the devil's: for the whole world of riches is for the faithful man, but for the faithless not even a penny. Now nothing is more faithless than the devil; and God says plainly by the Prophet, The gold is Mine, and the silver is Mine, and to whomsoever I will I give it. Do thou but use it well, and there is no fault to be found with money: but whenever you have made a bad use of that which is good, then being unwilling to blame your own management, thou impiously throwest back the blame upon the Creator. A man may even be justified by money: I was hungry, and you gave Me meat: that certainly was from money. I was naked, and you clothed Me: that certainly was by money. And would you learn that money may become a door of the kingdom of heaven? Sell, says He, that you have, and give to the poor, and you shall have treasure in heaven.
Source: Catechetical Lectures (New Advent)