What does John 15:20 mean?
Jesus is speaking these words shortly before He will be arrested and crucified (John 18:1–3; 19:18). A major theme of His words is reassurance: giving the disciples a perspective that will encourage them during the difficult times ahead (1 Peter 4:12–13). In prior verses, Jesus pointed out that those who faithfully follow Him will be hated by the world as a result (John 15:18–19). Knowing, in advance, that these hardships are expected and under God's control can make them easier to endure (John 13:9; 14:25, 29; 16:4).In this case, Jesus asks the disciples to remember something He said recently (John 13:16). The first time this teaching was given, His point then was that servants are expected to do anything their master would do. Here, the point is that servants can't expect to be treated better than their master. Those who "keep [your word]" are those who hear the gospel and respond. The unbelieving world doesn't want this, however (2 Corinthians 4:3–4; Ephesians 4:17–19). In fact, their natural response when Christians refuse to join in their sins is mockery and hatred (1 Peter 4:4).