The Tale of Two Horses :
Once there lived a poor carriage driver, who would take people for rides around the beach for money.
His two horses, though pulled the same carriage, had different views about their life.
The white horse, happy and contented with his life, loved what he did. He felt proud taking people around the beach and making them happy.
But the brown one, sad and subdued, always complaint about his life and that he should be doing something better.
It's all about the perspectives.
"Do not spoil what you already have by desiring what you have not."