Jesus said to his Apostles: "Behold, I am sending you like sheep in the midst of wolves; so be shrewd as serpents and simple as doves. But beware of men, for they will hand you over to courts and scourge you in their synagogues, and you will be led before governors and kings for my sake as a witness before them and the pagans. When they hand you over, do not worry about how you are to speak or what you are to say. You will be given at that moment what you are to say. For it will not be you who speak but the Spirit of your Father speaking through you." -Matthew 10:16-20
If we want the Lord to speak through us, we must first give Him the opportunity. Remaining silent and listening for His voice takes discipline. Have faith and courage that the Lord will provide. Often His voice is a foreign thought we hear in our mind, but it is the perfect answer. And other times, God knows the power of silence. We must practice listening for His response and discarding our own.