Jesus Prepares Us
Most likely, as the disciples listened to Jesus tell them they would be expelled from the synagogues and even killed, it went in one ear and out the other. Sure, it may have disturbed them a bit, but they most likely moved on rather quickly not worrying too much about it. But this is why Jesus said, “I have told you this so that when their hour comes you may remember that I told you.” And you can be certain that when the disciples were persecuted by the scribes and Pharisees, they did remember these words of Jesus.
The key is the Holy Spirit. The Holy Spirit plays a significant role right now in our world. That role is to strengthen us in our witness to Christ and to ignore any way the evil one would attack. So if you feel the pressure of persecution in any way, realize that Jesus spoke these words not only for His first disciples, but also for you.(My Catholic Life)