score:4
I was a bit skeptical, but the quote appears to be legitimate. It's from one of Jerome's homilies. Merely searching for jerome manger silver, I found this page in The Homilies of Saint Jerome, Volume 2.
Here's a more complete quotation:
O, if only I were permitted to look upon that manger in which the Lord lay! Now, as an honor to Christ, we have taken away the manger of clay and have replaced it with crib [sic] of silver, but more precious to me is the one that has been removed. Silver and gold are proper to heathendom; Christian faith is worthy of the manger that is made of clay. He who was born in that manger cared nothing for gold and silver. I do not find fault with those who made the change in the cause of honor (nor do I look with disfavor upon those in the Temple who made vessels of gold), but I wonder at the Lord, the Creator of the universe, who is born, not surrounded by gold and silver, but by mud and clay.