A pearl is worthless as long as it is still in its shell.
More Indian Proverbs:
Snakes turn milk into poison.Indian
Garlic is as good as ten mothers.
Indian
The grown-up pays attention to what you are doing; the child sees beyond that.
Indian
You do not stumble over a mountain, but you do over a stone.
Indian
That which blossoms must also decay.
Indian
If they don't exchange a few words, father and son will never know one another.
Indian