It's not enough to be skilled with words or know the Bible. It takes the anointing of the Holy Spirit to press the truths of God into men's hearts.
Ask God to take the words of the preacher and make them real as only He can. When God speaks, things are created, hearts are changed.
Ac 1:8 But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth.
Lord, You have the name that is above all names. You are Lord forever and there is no one who can challenge Your authority and power. You rule forever and ever, and there is no end to Your Kingdom.
Lord, just as You anointed Your disciples, I ask that You would anoint Your servants
to go out in Your name and represent You in power. Confirm their witness with wonders and miracles. Bless those who hear their testimony and see their lives to receive Your truth. Fill Your servants
with Your Holy Spirit and with power, that their lives might testify of Your glory.