What does John 16:32 mean?
Earlier in this same conversation, Peter arrogantly declared he would follow Christ anywhere, even to his own death. Jesus responded by predicting Peter wouldn't even remain loyal until sunrise (John 13:36–38). It's not that Peter will never be brave and loyal; he just hasn't arrived at that state, yet. After Christ's resurrection (John 20:19), empowered by the Holy Spirit (John 16:13), Peter will be radically fearless in declaring Christ (Acts 4:13). One day, that faith will indeed lead to martyrdom (John 21:18).Other gospels record the same prediction Jesus makes here (Matthew 26:31; Mark 14:27). When crisis arrives (John 18:1–3), every one of these men will abandon Jesus and flee in terror. This is also part of fulfilled prophecy. That Jesus will be left alone is prophesied by Isaiah (Isaiah 63:5). The phrasing found in Matthew and Mark more clearly implies a prophecy in Zechariah 13:7, referring to sheep scattering from the shepherd.
Despite being abandoned by His earthly friends, Jesus will not be entirely, infinitely alone. His relationship with God the Father will be the cornerstone of Jesus' faith during the upcoming hardship (Matthew 26:39–42).