We are to welcome and accept one another warmly, in spite of our differences, for the same reason that God has welcomed and accepted us—we are recipients of grace, declared righteous in Christ. We will often differ with one another over secondary matters, but the gospel provides and builds a unity that allows us to disagree in humility and love.
Israel is suffering and Habakkuk brings a complaint to God. God reveals to Habakkuk that he is planning to bring further discipline on Israel, and Habakkuk complains again to God. God shows Habakkuk that he is doing things greater than Habakkuk can see or understand. In response to this reminder of God's greatness and glory, Habakkuk humbles himself in prayer to God, by waiting on God, and rejoicing in God through faith in God's goodness and promises.
Christian community is built around our shared experience of the gospel. Community always begins with God, and God gives us community as a means of transforming our lives more and more into the image of his son. However, community is not merely a tool for growth, but also a gift from God for our joy as well as for our good.
God intends for men to invest ourselves in the lives of others, working for his purposes rather than our own. We are to influence others for good, helping them to understand and pursue Christ-likeness. This begins with our families, but extends to God's church and also to the unbelievers that God has placed in our lives. Our serving others requires selfless sacrifice on our part, but God will provide us the grace and strength to be faithful to our calling as we obey.