[...] Lucien was so engaging, he had such winning ways, his impatience and his desires were so graciously expressed, that his cause was always won before he opened his mouth to speak. This unlucky gift of fortune, if it is the salvation of some, is the ruin of many more. Lucien and his like find a world predisposed in favor of youth and good looks, and ready to protect those who give it pleasure with the selfish good-nature that flings alms to a beggar, if he appeals to the feelings and awakens emotion; and in this favor many a grown child is content to bask instead of putting it to a profitable use. With mistaken notions as to the significance and the motive of social relations they imagine that they shall always meet with deceptive smiles; and so at last the moment comes for them when the world leaves them bald, stripped bare, without fortune or worth, like an elderly coquette by the door of a salon, or a stray rag in the gutter.
I prefer "but the moment comes when the world closes its doors to them"