Amos 3:3 Can two walk together ,except they be agreed?
This is not saying people need to be in unity or have the same point of view about everything, but you need to be in an agreement to meet if you are to have a mutually beneficial coexistence.
When people are going in opposite directions, they meet and continue on. This is not good for communication. Someone will be frustrated when someone else is not holding up their end of a perceived contract. It does not aid in success.