Peter adamantly denied Christ. Even though he had told Jesus that he would die for him rather than to deny him. But when he was alone in the world, facing others, he turned his back against his Lord.
Not very long after Peter’s infamous denial we read of his first message given to the church through the Holy Spirit. In this case Peter boldly declared Christ before the men and women. He preached Jesus and him crucified and risen again. The boldness Peter possessed was a stark contrast to his cowardliness only months before.
The difference in Peter? The Spirit.
Peter found strength to stand for Jesus because the Spirit was comforting him, making him bold, giving him strength. He was no longer alone; Christ lived within him.
The indwelling of the Holy Spirit can have that type of an effect on us too. Allow God to work through you.