Power in the Holy Spirit

Yesterday in my AP Biology class Dr. Dodd was debating with a student about gun laws and 2nd amendment stuff, as we were about to start notes someone brought up the subject of abortion. When Dr. Dodd was stating his position is was very obvious that he is pro-life and as the debate continued it turned into an evolution discussion. I remember and know in my head what the truth is from going through Biblical World View class/ the Truth Project, but I don't know how to say it. After the bell rang he called me over to him, he told me to speak up in those times, and that the argument coming from me would mean more to the student than it does coming from him. I told him that I know it in my head but don't know how to say it. He then shot back at me saying, "the Holy Spirit will give you the words to speak; Be bold!" I had been bringing my Bible to school since Monday and he asked about it a couple times so I think he knows that I am a believer and I know he is because of some of the attitudes he has expressed earlier in the year. It has been encouraging and challenging to me to really stand up and speak what I know and the Holy Spirit will give me the rest.