Work in society splits into many branches. Bakers, smiths, weavers, printers.

What links the people of one branch?

They do the same thing. They have similar worries and interests. When they join together, an association arises.

What changes through this?

Each person still pursues his own purpose. But at the same time, he sees a common purpose in it. The selfish purpose becomes a universal one.

How far does this purpose reach?

No further than the trade itself. The printers care about printing. Their common purpose is quite concrete.

Summary: People of the same trade join together in a corporation. In it, their own purpose becomes a common one at the same time. This purpose reaches as far as their trade.