What does the Bible say about seeking the happiness of others?

In Romans 15, Paul emphasizes the importance of seeking the happiness and well-being of one another as a reflection of Christ's love. He indicates that believers should bear the weaknesses of the strong and make efforts towards the edification of others. This principle of self-denial and seeking others' good is contrary to human nature, which tends to be self-seeking. By following Christ's example, believers are reminded to treat each other with love, reflecting the love God has poured into their hearts.