“What Christ asks of His disciples is not so much exposition of doctrine about Himself as a witness to His power. Witness to His power can be given by the most illiterate if he has experienced it. It does not require long training for a man to say, “One thing I know, that though I was blind, now I see”” (John 9:25). Questions came to this man from the Pharisees that he could not answer except with “I do not know”.
The power for effective witness is not in how much you know, but in who you know. So powerful was the change in Saul’s life that he “immediately…proclaimed Jesus” (Acts 9:20). Let the Holy Spirit do a fresh work in your life that witnesses to the person of Christ so others are drawn to Him!
(The Spontaneous Expansion of the Church and the Causes Which Hinder It, Page 32).