St. Paul loved Sts.Timothy and Titus as brothers in the Lord. He prayed for them "constantly, night and day" (2 Tm 1:3). Timothy loved Paul so much that he cried when they parted (2 Tm 1:4). When Paul "was under all kinds of stress," he was strengthened just by "the arrival of Titus" (2 Cor 7:5-6). He so depended on Titus that he did not preach in Troas because he did not find his brother Titus there (2 Cor 2:12-13).

Paul, Timothy, and Titus loved one another and their other Christian brothers and sisters so much that they finally laid down their lives for Jesus and each other (see 1 Jn 3:16). The Bible seems to indicate that our baptismal brotherhood and sisterhood is as deep a relationship as is possible for a human being. It is not necessarily deeper than the marriage relationship, but it does not seem less deep.

Brotherhood and sisterhood in Christ is not a sexual relationship. It is characterized by "absolute purity" (see 1 Tm 5:2). It is a miraculous relationship only made possible by our baptism into Christ. In baptism, we can be united with our Christian brothers and sisters, as Jesus and the Father are united. Jesus is specifically praying for this (Jn 17:21). Thus, we as brothers and sisters in Christ can share in the unity of the Trinity.