If we are faithful to Jesus, we will also be faithful to one another. We belong to one another. [Anyone who dedicates himself or herself to Jesus] will be united with other believers, and they will become so united that they are like one body.
In the human body, if anything threatens the eye, the arm will move quickly to protect it, even if it is injured in doing so. This happens automatically, as if out of love.
It is the same among those who dedicate themselves to Christ and to each other. Each should be willing to suffer for the other–the stronger one for the weaker.
from Discipleship