For we have heard for ourselves....

"Many Samaritians from that town believed in him because of the woman's testimony, 'He told me all that I ever did.' So when the Samaritans came to him, they asked him to stay with them, ad he stayed there two days. And many more believed because of his word. They said to the woman, 'It is no longer because of what you said that we believe, for we have hear for ourselves, and we know that this is indeed the Savior of the world.' " John 4:39-42

Through the testimony of the "woman of Samaria" many believed in Jesus. But as they sat under Christ's teaching it was through His Words, which they heard for themselves, that they knew he was the Savior of the world. There is power in our testimony (as people see Christ's work in us), but what a relief that it is through the proclamation of God's Word that people come to know Christ as their Savior. I think sometimes we forget the power of the Gospel and the transforming power of the Word of God.