The persecutor turned preacher

If we have been truly saved then we have been changed from one thing to another. But if we are still acting the same then something is wrong. Saul here shows us that a definite change will take place after being saved. He began to preach or witness about Jesus and what He has done. This left some people puzzled because his past didn't match his present. His spiritual growth disturbed some folks; this is a necessary thing. What has happen since you made a profession of faith?