All throughout the Bible, Jesus emphasizes the importance of sharing testimony to everyone, including his despises who he instructed to tell everyone.  The Holy Spirit empowers the believers to share their testimony and drives them with wisdom and truth.  In Revelation, it mentions believers conquering through their word of testimony. In Revelation 19:10, it highlights the testimony of Jesus as the spirit of prophecy. In Deuteronomy 19:15, it talks about needing testimony from two or three witnesses to establish a law, and the same to declare truth from the Lord.  Jesus states that two witnesses are true, and he supplies testimony alongside the father, as stated in John 8.God reveals himself and his character through his actions and words, which are a form of testimony.  In Isiah 8:20, it tells the people to go to the 'Law and Testimony' as a guide.  In Isiah 43:12, God acts as His own witness and declares that He has proclaimed His deeds and saved His people.  Our Testimonies show others His greatness and spreads the word around the world.  People can see for themselves how amazing our God is.