Acts 1:8 "But when the Holy Spirit has come upon you, you will receive power and will tell people about me everywhere---in Jerusalem, throughout Judea, in Samaria, and to the ends of the earth.."
Sermons have been preached on this verse. Whatever may be said has probably already been said many times. However, there are a couple of things I would like to remind us of today. One, is that the presence of the Holy Spirit in our lives affects our lives. There is power from God that comes upon us when He is in us. This power has a two-fold effect on us: it moves us into godliness and it moves us into action. You cannot have Christ without His Spirit and you cannot have His Spirit without changing.
Another thing to note is that we are witnesses for Christ whether we recognize it or not. If you are a child of God today, your life is a witness for Him. Your life reflects His life. You are either a good witness or a bad witness, depending on how you are living.
People are noticing what kind of a witness you are. It begins at home and spreads out from there. The lives you interact with are being influenced either for or against Christ because of you. You can't avoid it.
If you want to make a difference for Christ in the world, it first begins at home with those who know you best. The farther away from home you get, the less likely it is that others will know you well and be affected by your living. However, you influence the most those who are watching you live out your faith in the daily grind of life.
The Spirit of God is at work and wants to help you be a good witness for Christ. Are you co-operating with Him?