A blind man had been waiting a while at a busy road for someone to offer to guide him across, when he felt a tap on his shoulder.
"Excuse me," said the tapper, "I'm blind - would you mind guiding me across the road?"
The first blind man took the arm of the second blind man, and they both crossed the road.
Apparently this is a true story. The first blind man was the jazz pianist George Shearing. He is quoted (in Bartlett's Anecdotes) as saying after the event, "What could I do? I took him across and it was the biggest thrill of my life."
There are times when we think we cannot do something and so do not stretch or take a risk. Being forced to stretch and take a risk can often help us to reduce our dependencies (on others, or our own personal safety mechanisms), and to discover new excitement and capabilities.