A chicken eats corn, drinks water, swallows pebbles, yet she complains of having no teeth. If she had teeth, would she eat gold? Let her ask the cow who has teeth yet eats grass.
— Ola Rotimi
What it means
The chicken manages perfectly well. She eats corn, drinks water, and grinds it all down with swallowed pebbles instead of teeth. Then she complains about the teeth.
Rotimi's reply is sharper than "be grateful". He points at the cow. The cow has a full set of teeth and spends its day eating grass. So teeth were never the thing standing between the chicken and a better meal.
That is the trap being described. We decide one missing thing is the reason our life is small — the money, the qualification, the contacts — and we watch whoever has it. But look at what they actually do with it. Often they are eating grass.
The fault is not in wanting more. It is in picking the wrong thing to blame.

Source
- Rotimi, Ola. The Gods Are Not to Blame. Oxford UP, 1996.