The document discusses the language of spiritual friendship as described in 1 Corinthians 13:4-7. It defines spiritual friendship as love given by God that combines goodwill and charity between Christians seeking to follow Jesus. The language of spiritual friendship is described as being patient and kind, not selfish or rude, rejoicing in truth over evil, and encouraging protection, trust, hope and perseverance between friends. Learning this language involves understanding these biblical principles, practicing them with others, and making spiritual friendship a priority like a first language.