A Herdsman tending his flock in a forest lost a Bull-calf from the fold. 

After a long and fruitless search, he made a vow that, if he could only discover the thief who had stolen the Calf, he would offer a lamb in sacrifice to Mercury, Pan, and the Guardian Deities of the forest. 

Not long afterwards, as he ascended a small hillock, he saw at its foot a Lion feeding on the Calf. 

Terrified at the sight, he lifted his eyes and his hands to heaven, and said: 

"Just now I vowed to offer a lamb to the Guardian Deities of the forest if I could only find out who had robbed me; but now that I have discovered the thief, I would willingly add a full-grown Bull to the Calf I have lost, if I may only secure my own escape from him in safety."

When you look for a solution, have present that, on having found it, this one in turn can become the following problem.