I was blind, now I see. Some people have a special ability to share the gospel with their testimony. Some people may only be reached through a testimony. Many Samaritans believed after hearing the testimony of the woman at the well. The woman at the well also invited others to come see Jesus.
Some people have a special ability to invite others to a place where they can hear the gospel.
Some people may only be reached through an invitation. That some believed after her testimony and many others believed after her invitation indicates that some people can be reached one way while others must be reached a different way. Paul used an intellectual approach to witness on Mars' hill. He even quoted their pagan poets. Paul used his knowledge of their beliefs to share the gospel in a way they understood.