One way or another, Christians need each other and everyone contributes to the well-being of the body of Christ. The apostle Paul expresses it in the first epistle he wrote to the Corinthian church.
1 Corinthians 12:12 New International Version (NIV)
12 Because just as the body is one, and has many members, but all the members of the body, being many, are one body, so is Christ.
The human body is an exquisite organism. Scientists cannot duplicate it, nor can they fully understand it. It is a synthesis of many parts that work together in an integral whole. What affects a part of the body, affects the whole. Each body member is related and depends on the other parts of the body. Each part contributes to the well-being of the whole body. And so it is with respect to all believers as members of the body of Christ. We must function in the body of Christ as the parts of the human body function in it. Amputation of one arm is an impediment to the whole body. There is no brother in faith that we do not need. This clearly shows how our lives are intrinsically united within the body of Christ, and how our well-being depends on the well-being of others (Ro 14: 7). Let Christ join us closely in his church.