Is the Holy Spirit only for Christians?
The Holy Spirit only lives within Christians. That's one definition of Christians - people who have the Holy Spirit living in them (look at Romans 8:9). But the Holy Spirit also works in people's lives before they become Christians.
John 15: 26-27
When we tell our friends about Jesus it is the Holy Spirit who gives us the power and the courage. But it is also the Holy Spirit who works in our friend's lives to help them to understand the truth of what we are saying.
John 16: 7-11
If we'd asked them, the disciples would probably have said that they would have liked Jesus to stay with them for ever. But Jesus says it's better for the Holy Spirit to come. why? Well, one reason is that Jesus could only be in one place at one time. Imagine if you had to go all the way to Israel to speak to Jesus! But the Holy Spirit is with all Christians everywhere.
. . . God for the Holy Spirit and especially the help he gives us in telling others about Jesus. Think of your friends who need to know Jesus. Write down the names of one or two of them and pray for them today that the Holy Spirit will help them to know the truth about Jesus.