As spiritual growth continues, Peter turns our focus outward: “add…to godliness brotherly kindness” (2 Pet. 1:7). Up to this point, the qualities have emphasized personal development and devotion to God. Now the emphasis shifts to how we treat others—especially fellow Christians.
“Brotherly kindness” is the Greek word philadelphia, meaning “love of the brethren.” It describes the affection, care and concern that Christians are to have for one another as members of the same family. Scripture commands us to “continue” in it (Heb. 13:1) and “increase more and more in it” (1 Thess. 4:9-10). In fact, we have been purified in Christ for the purpose of loving one another (1 Pet. 1:22).
Brotherly kindness is essential because it reflects our relationship with God. John makes this clear: “He who does not love his brother whom he has seen, how can he love God whom he has not seen?” (1 John 4:20). Jesus also made it an identifying mark of being His disciple (John 13:34-35). In a world often marked by division and hostility, genuine brotherly kindness stands out powerfully.
Brotherly kindness is necessary for unity. Churches cannot remain strong and unified without it. Love produces patience, forgiveness and a willingness to work through difficulties. Without it, even small problems can lead to division.
So how do we develop brotherly kindness? First, it requires purity of heart. When we obey the gospel, our souls are cleansed, making sincere love possible (1 Pet. 1:22-23). A pure heart lays the foundation for genuine relationships.
Second, it requires learning from God. The Father demonstrated love by giving His Son (1 John 4:9-10), and Jesus showed love through His sacrifice (1 John 3:16). The love of God helps us understand how to love others.
Third, it requires time and connection. Just as relationships in a physical family grow stronger through shared experiences, so our love for one another deepens as we spend time together, worship together and serve together.
Fourth, it requires prayer. It is difficult to harbor resentment for someone when we are regularly praying for them. Prayer softens the heart and strengthens love.
Brotherly kindness is demonstrated in both attitude and action. It shows in consideration for others, careful speech and a willingness to limit personal liberties for another’s good (Rom. 15:1; 1 Cor. 8:13). It also shows in service—encouraging, helping and building one another up (1 Thess. 5:14).
As we grow in Christ, we must recognize that a strong faith must be accompanied by a strong love for the brethren.