It was not common to follow a teacher fulltime. The reason for following Jesus fulltime is not stated, but it is obvious to think of their unimaginably important task: to be the foundations of the church, coregents and judges with Christ and judges (Ephesians 2:20; Revelation 4:4; Revelation 21:14; Matthew 19:28). They also largely determined the content of the New Testament (John 14:25–26).
18 Comme il marchait le long de la mer de Galilée, il vit deux frères, Simon, appelé Pierre, et André, son frère, qui jetaient un filet dans la mer; car ils étaient pêcheurs.