This is a fable by Babrius showing that grasping people often destroy the very thing that is of benefit to them.
The Goose that Laid the Golden Eggs
A CERTAIN man had the good fortune to possess a goose that laid a golden egg every day. Dissatisfied with one egg a day, and thinking to obtain the whole treasure at once, he killed the goose, and, cutting her open, found her - just what any other goose would be!
Text: John Coker edition (p112, 1927).
Selected parallels: Babrius 123. Avianus 33. Caxton, (Avianus 24). La Fontaine 5/13. L’Estrange 1/247. Chambry 287. Perry 87. Daly 87. TMI D876.