The image of the bridge is a beautiful metaphor. On the bridge you have two points, two ends. Normally we think a person should have only one standpoint, but when you become a bridge you have to have two. This is also a kind of explanation for the concept of crossing the border of the self: as one person, you should have many standpoints. Between these two points, there is one that is more stable, your original personality and another point which is less stable, floating. This bridge is always dangerous.
"I walked for I don’t know how long before I came up to a big body of water. The big body of water was blue and silver and rippled and looked as if it had been a painting painted by a woman. I wanted to get across it but I couldn’t swim. I wanted to get across it but it would take me years to build a boat. I wanted to get across it but it would take me I didn’t know how long to build a bridge. Years passed and then one day, feeling like it, I got into my boat and rowed across."
If the building of a bridge does not enrich the consciousness of those working on it, then don’t build the bridge, and let the citizens continue to swim across the river or use a ferry.