8 But you will receive power when the Holy Spirit has come upon you, and you will be My witnesses in Jerusalem, in all Judea and Samaria, and to the ends of the earth.
That every Christian has the Holy Spirit in their life though does not mean that every Christian sees the work of the Spirit in their life.
The promise of the Holy Spirit is sure, but the work of the Holy Spirit through our lives is dependent upon our subsequent obedience and submission to the will of God. As we become witnesses of God, from God, to God we see the power of the Holy Spirit. When the Holy Spirit comes on you, you receive power to be witnesses. That is to say, that in the midst of witnessing you are empowered. This is not the same as we might think of powering your car. You put gas into your car and then your car is able to move. It is that the power supply is always present and when you begin witnessing you see the results of the power in your life.
If you feel that as a Christian your life is listless, that you have no ability to do anything and that God is not using you. I will tell you that you ability is linked to the presence of the Holy Spirit in your life. If you are genuinely saved, than the Spirit is there. If he is there then you have the ability to do whatever it is that He places before you. So then your listless life is not due to a lack of ability but a lack of obedience and submission. Become a witness to God and you will see the power of the Holy Spirit in your life. Consider this, why would the Spirit empower you to live just as everyone else who is not a Christian lives? What would be the point? Do not sit on the couch waiting for some kind of vision or great spiritual awakening, rather, become obedient to what the Spirit is leading you to do and see His power. Real life occurs when we step out in faith without seeing the power of God but knowing that the Spirit has been given and his power promised. It is then that you will really discover what Jesus meant when he said, “I have come that you might have abundant life,” and “you will do greater things that I.”