Vernon Jones (1912)
114. THE LIONESS AND THE VIXEN
A Lioness and a Vixen were talking together about their young, as mothers will, and saying how healthy and well-grown they were, and what beautiful coats they had, and how they were the image of their parents. "My litter of cubs is a joy to see," said the Fox; and then she added, rather maliciously, "But I notice you never have more than one." "No," said the Lioness grimly, "but that one's a lion."
Quality, not quantity.
Aesop's Fables: A New Translation by V.S. Vernon Jones with illustrations by Arthur Rackham (1912). This book is available online at Project Gutenberg.