Never close those doors 
Before you're sure it's right 
Always look to the future 
But don't forget the past 
 
Each bridge you cross over 
Must be left not destroyed 
You never really know when 
Retreat will be all you have  
 
Look back over your shoulder  
Now and then to reassure yourself 
You made the choices that are right 
For the walk in life you need now 
 
Never let go of memories 
For they may be all you hold
Fiona Davidson
http://www.poemhunter.com/poem/bridges-crossed/