What does John 16:27 mean?
Christ is reassuring the disciples that they will better understand His teachings when they have the influence of the Holy Spirit (John 16:12–13; 16:25). In the prior verse, Jesus alluded to the intimate, immediate connection which the Spirit allows between God the Father and each individual believer (Jeremiah 31:31–34).Jesus often noted the intimate connection between Himself and God the Father (John 10:30). A major theme of His preaching was that belief in Him—in Christ—was absolutely necessary in order to be reconciled with God (John 3:16–18, 36; 14:6). Scripture makes it clear that belief in Jesus is the one and only way for a person to know God (John 6:28–29). Those who don't know Christ do not know God—and their rejection of His Son proves this (John 15:18–23).
Likewise, those who humbly follow God (John 14:15, 21) give evidence they are truly part of His people (John 14:23). Those who don't submit to God won't have the helpful influence of the Spirit (1 Corinthians 2:14–16) and will be more likely to misunderstand (Matthew 11:25–26).
John 16:25–33 completes Christ's combination of encouragement and warning as He prepares the disciples for His impending arrest (John 18:1–3). This passage summarizes the general message of that discourse: that hardship and persecution will come, but believers should remain faithful, knowing this is all part of God's knowledge and His will. Rather than reacting in panic or doubt, followers of Christ should feel a sense of peace. This confidence is inspired by knowledge that nothing they experience catches God by surprise. The expression "take heart" implies courage: knowing Christ's victory overshadows all those troubles.
Throughout His teaching in the Last Supper (John 13:1–5), Jesus has often brought up the fact that He's giving His followers advance warnings (John 13:19; 14:25). His intent is to provide encouragement—persecution as a result of their faith is inevitable. In keeping with that reassurance, Jesus again promises the coming of the Holy Spirit. He explains that after a time of deep sorrow, His followers will experience great joy and clarity. This concludes with a beloved promise that Christ has "overcome the world."