I have come across the following passage from the Thessalonians (1 Thess 5: 13) earlier as well. However, this particular version of it stood out very much as a perfect synthesis of community life:
Try to get along with each other in the community. Warn those who are doing too little, encourage those who are anxious, and reach out to those who are burdened. Be patient with each person and sensitive to individual needs. When you get on each others nerves, don't answer back without thinking. Look for the best in others, and try to bring it to the surface for the good of the whole community. Stay cheerful whatever happens, thanking God for everything. This is the way people are called to live the life of the risen Jesus.