Wise old fool

Once there was a wise old fool who carried his lamp in his rucksack.
When I saw him coming, I laughed at him:
Why do you carry your lantern inside your rucksack
Why not take it out to guide you on this dark night?
The wise old fool said:
Why do you hide your heart?
You have made the sweetest of nests
For a bird who never tests her wings.