The Greek word translated ‘Power’ in this verse of Scripture is Dunamis, which means ‘the dynamic ability to cause changes.’ This therefore means that you receive the dynamic ability to cause changes when the Holy Spirit comes into your life. The Christian life with the Holy Ghost is not an ordinary life. With Him, you can cause changes in life’s situations.
Something else happens to you when you receive the Holy Ghost: you receive the ability and power to witness boldly of Christ - you become a proof-producer. In other words, you’ll be able to prove the working of the Spirit of God and the Kingdom of God. Christianity is not a religion, neither is it an ordinary life. To be a Christian is to be a ‘Christ-in-you’ person. That means Christ lives in you, and the anointing of God is on your life.
In 2 Corinthians 5:17 the Bible says, “Therefore, if any man be in Christ, he is a new creation; old things are passed away; behold all things are become new.” Actually, when you study this carefully, you’ll realize that the Christian is a new species of being; he’s someone who has never existed before; he doesn’t have a past. Though he may look the same, he’s a brand new person in his spirit. He may not feel like it; he probably wouldn’t, because it doesn’t happen in the realm of the senses. It’s an experience that takes place in your spirit, but before long it starts affecting your body and your mind.
From the hour you gave your heart to the Lord Jesus Christ, you became eligible to receive the Holy Spirit. And He came with the dynamic ability for you to cause changes, to do things right and to make things work. With the Holy Spirit in your life, you’re no longer helpless, because He gives you the ability to change the circumstances of your life to suit you.