In answering this question, let us look at what characteristics we ought to be living out with the help of the Christian community. These characteristics are found in verses 5, 6, and 7 of this chapter. We are told that we are supposed to
make every effort to add to your faith goodness; and to goodness, knowledge;6 and to knowledge, self-control; and to self-control, perseverance; and to perseverance, godliness;7 and to godliness, mutual affection; and to mutual affection, love.
What that means is that we are supposed to possess the characteristics of faith, goodness, knowledge, self-control, perseverance, godliness, mutual affection, and love. So, we must then ask how the Christian community can help us to live a live full of these things.
Basically, what the community can do (and we can do for the others in the community) is to support one another as we strive to embody these characteristics. We can think of this, in a way, as being similar to a “support group” that helps get people through a specific kind of trouble. The members of the Christian community need to act as a support group to help one another get through life in a world that does not always value the things Christians should value. The Christian community can help us gain the knowledge of God. It can help us to be good and to have self-control by supporting us when we feel tempted. Our fellow Christians can help give us the strength to persevere and maintain our godliness when it is hard to do so.
In all of these ways, the community can support Christians as they try to live lives filled with these characteristics.