How do we know true brotherly love is present?

To ascertain the presence of true brotherly love, we should examine whether our affections stem from a genuine love for God and obedience to His commands (1 John 5:2). This love is characterized by its extension to all who love Christ sincerely, without being confined to personal interests or affiliations. True brotherly love is gentle, patient, and kind, seeking to support and uplift fellow believers in times of need, which serves as evidence of a transformed heart and a relationship with the Divine.