Gregory the Great
Catena Aurea · Lukasevangelium 15
Either what woman having ten pieces of silver, if she lose one piece, doth not light a candle, and sweep the house, and seek diligently till she find it? And when she hath found it, she calleth her friends and her neighbours together, saying, Rejoice with me; for I have found the piece which I had lost. Likewise, I say unto you, there is joy in the presence of the angels of God over one sinner that repenteth.
(Hom. 34. in Ev.) He who is signified by the shepherd, is also by the woman. For it is God Himself, God and the wisdom of God, but the Lord has formed the nature of angels and men to know Him, and has created them after His likeness. The woman then had ten pieces of silver, because there are nine orders of angels, but that the number of the elect might be filled up, man the tenth was created.