Division always comes through human agency, and unity can come only through human agents.
But such individuals are in grave need of help and support. The nature of this assistance is suggested by a comparison with the cantilever bridge. The span which actually bridges the gulf in the cantilever structure rests its weight upon other spans, which in turn are set on piers which go down to bedrock. The bridge itself does not actually rest upon the piers and it would collapse without those sections upon which it rests. So in the task of re-uniting separated brethren, some individuals in their own persons have the gifts or talents to span the gulf, reaching from one distinguishable group to another in Christian love.