Acts 4:7-10 says, “They (the rulers, elders, and teachers of the law) had Peter and John brought before them: ‘By what power or what name did you do this (Heal a lame man)?’ Then Peter, filled with the Holy Spirit, said to them: ‘Rulers and elders of the people! If we are being held to account today for an act of kindness shown to a cripple and are asked how he was healed, then know this, you and all the people of Israel: It is by the name of Jesus Christ of Nazareth, whom you crucified but whom God raised from the dead, that this man stands before you healed.”
Jesus is not just some person from the past. Jesus is alive today. Through the work of the Holy Spirit He is with us always, and it's by His name that lives change. The crippled man’s life was changed. Peter's life had changed too. Two weeks before this event he had denied knowing Jesus to a slave girl, only to stand up to all the religious leaders in the verses above. It was through the Holy Spirit that he could do it.
God chooses normal, everyday sinners like you and me to tell and show others the way. May we not be afraid to share the good news when we’re feeling the nudge. Even if we’re not confident, we fumble over our words, and have fear. The Holy Spirit will help the other person only hear what God has for them. Just use your own story and point people to Christ.