Beware of the Unsaddled Horse

Beware of the unsaddled Horse
Said a man to three sons
For, his ride is fierce  
Thrilling, though it may be
Few have ever returned
 
His rider is cold and blank
An empty shell, once a man
Saddled is the rider  
Whoever he may be
His Horse holds the reigns
 
Oh, how he was warned  
Careful son, that horse will buck
If you must ride, stick with the pony
Though not much of a thrill  
He'll get you where you're going
 
Two rode the pony, the middle a taste
His ride was slow and dull
No thrill at all for the elder and young
There stands the lofty steed
Just one ride, an adventure, that's all!
 
Two rode that Horse, one returned
The elder not dead, but misplaced
Lost, but alive; his soul we mourn
The younger rode fast, and he strayed
Home at last, for a trail he had laid
 
So, brave is he, the one who returned  
His lamented heart filled with remorse
My brother, what have you learned?
Beware of the unsaddled Horse
For his ride is Fierce